B We then convert the number of moles of glucose to the required mass of glucose: \( mass \: of \: glucose = 0.155 \: \cancel{mol\: glucose} \left( \dfrac{180.16 \: g\: glucose} {1\: \cancel{mol\: glucose}} \right) = 27.9 \: g \: glucose \). -9.38 = log (Kb) To determine the volume of stock solution needed, divide the number of moles of glucose by the molarity of the stock solution. Example: A solution has a pOH of 11.76. Trouvez ci-dessous tout le Pro des Mots Défi Quotidien 2 Mai 2018 Solution. De très nombreux exemples de phrases traduites contenant "find out a solution" – Dictionnaire français-anglais et moteur de recherche de traductions françaises. We then convert the number of moles of solute to the corresponding mass of solute needed. Follow our easy-to-use tool below to determine which Webair solutions best suit your business needs. Find the Words Answers, Cheats and All solutions to every level and pack. The hydronium Calculating hydronium ion concentration from pH, Calculating hydroxide ion concentration from pOH. The procedure for preparing a solution of known concentration from a stock solution is shown in Figure \(\PageIndex{3}\). Also, the number of moles of solute in 258 mL of the stock solution is the same as the number of moles in 2500 mL of the more dilute solution; only the amount of solvent has changed. Many translated example sentences containing "find a solution" – French-English dictionary and search engine for French translations. Note that the volume of the solvent is not specified. If a solution contains 1.43 M (NH4)2Cr2O7, then the concentration of Cr2O72− must also be 1.43 M because there is one Cr2O72− ion per formula unit. Watch the recordings here on Youtube! Add 5 to both sides. Find the Solution That is Right for You. Explanation: . Legal. Cherchez find a solution et beaucoup d’autres mots dans le dictionnaire de synonymes anglais de Reverso. [OH-] = 10-5.70 = 2.00 x 10-6 M. On a calculator calculate 10-5.70, or "inverse" log (- 5.70). Example: What is the pKa of acetic acid, if Chemists use many different methods to define concentrations, some of which are described in this section. reverse mathematical operation employed to find the pOH. It is not important if the principle was used before for delivering other functions. In determining the volume of stock solution that was needed, we had to divide the desired number of moles of glucose by the concentration of the stock solution to obtain the appropriate units. The so-called D5W solution used for the intravenous replacement of body fluids contains 0.310 M glucose. What would your ideal solution to this problem look like? To calculate the pOH of a solution you need to know the concentration Consultez la Solution 4 Indices Quel est le Mot Niveau 5, ne restez plus bloqué et trouvez grace à JEU .info toutes les réponses et astuces pour terminer le jeu. Calculate the mass of glucose necessary to prepare a 500 mL pouch of D5W. -9.74 = log (Ka) 180 table need to be setup. 2 auction galleries/hour * 3 hours = 6 galleries/hour. Example: What is the hydronium ion concentration in a solution A concentration expressed on an m/m basis is equal to the number of grams of solute per gram of solution; a concentration on an m/v basis is the number of grams of solute per milliliter of solution. To start viewing messages, select the forum that you want to visit from the selection below. Given: identity of solute and volume and molarity of solution. a hydroxide ion concentration of 4.82 x 10-5 M? Because we are given the volume of the solution in liters and are asked for the number of moles of substance, Equation \ref{4.5.2} is more useful: \( moles\: NaOH = V_L M_{mol/L} = (2 .50\: \cancel{L} ) \left( \dfrac{0.100\: mol } {\cancel{L}} \right) = 0 .250\: mol\: NaOH \), Exercise \(\PageIndex{1}\): Calculating Moles from Concentration of Alanine. The hydronium ion concentration is 0.0025 M. Thus: pH = - log (0.0025) = - ( - 2.60) = 2.60 Top Calculating the Hydronium Ion Concentration from pH. $\begingroup$ While urea is not found as commercially available IV solutions, one could see it being used as a hypothetical one in a physiology question. For aqueous solutions at 20°C, 1 ppm corresponds to 1 μg per milliliter, and 1 ppb corresponds to 1 ng per milliliter. \( NaOH(s) \xrightarrow {H_2 O(l)} Na^+ (aq) + OH^- (aq) \). Therefore, \[ moles\: CoCl_2 \cdot 2H_2O = \left( \dfrac{10.0 \: \cancel{g}} {165 .87\: \cancel{g} /mol} \right) = 0 .0603\: mol The HCl is a strong acid and is 100% ionized in water. Let’s try… Continue reading "Find the Words Answers and Cheats All Levels" It is, equivalently, the number of millimoles of solute present in exactly 1 mL of solution: \[ molarity = \dfrac{moles\: of\: solute}{liters\: of\: solution} = \dfrac{mmoles\: of\: solute} {milliliters\: of\: solution} \label{4.5.1}\]. Glucose has a molar mass of 180.16 g/mol. As shown in Figure \(\PageIndex{2}\), for some substances this effect can be significant, especially for concentrated solutions. Find out why Close. B If the compound is a nonelectrolyte, its concentration is the same as the molarity of the solution. Another word for find the solution. Example: Calculate the value of the ionization constant, Calculate the number of millimoles of alanine, a biologically important molecule, in 27.2 mL of 1.53 M alanine. The molarity (M) is defined as the number of moles of solute present in exactly 1 L of solution. Then tap the bull. If either the pH or the pOH of a solution is known, the other can be Many people have a qualitative idea of what is meant by concentration. pH of this solution? Pick the best solution by comparing your various possible solutions against your problem, on the one hand and your ideal solution… Brain Out Game Level 220 is Solved on this page, With detailed image and text hints. Find out why Close. \nonumber\]. the following equation. The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] Solution Hero Rescue - Block Mode - Niveau 21 à 30 - Duration: 5:00. zoneasoluces.fr 1 view. Click hereto get an answer to your question ️ 88. quickly calculated. where the subscripts s and d indicate the stock and dilute solutions, respectively. Subscribe Subscribed Unsubscribe 11.8K. The Kb for an acid is calculated from the pKb So read on if you’re having a hard time coming up with an answer or two. of the hydronium ion in moles per liter (molarity). by performing the reverse of the mathematical operation used to find pKb. Divide the mass of the solute by the total volume of the solution. Divide by 2, 9/2 > x. Missed the LibreFest? Brain Out All Levels List Brain Out 45 Solution: Hint: ‘Please write down the correct answer to 4+5′, All the above Answers are wrong answers, you have to give the correct answer. We could also have solved this problem in a single step by solving Equation 4.5.4 for Vs and substituting the appropriate values: \[ V_s = \dfrac{( V_d )(M_d )}{M_s} = \dfrac{(2 .500\: L)(0 .310\: \cancel{M} )} {3 .00\: \cancel{M}} = 0 .258\: L \]. = antilog (- pH). what will be your answer? Find out how much a volunteer can produce in 3 hours. The answer we obtained makes sense: diluting the stock solution about tenfold increases its volume by about a factor of 10 (258 mL → 2500 mL). To prepare a solution that contains a specified concentration of a substance, it is necessary to dissolve the desired number of moles of solute in enough solvent to give the desired final volume of solution. Therefore, is read as “the concentration of sucrose is 1.00 molar.” The relationships between volume, molarity, and moles may be expressed as either, \[ V_L M_{mol/L} = \cancel{L} \left( \dfrac{mol}{\cancel{L}} \right) = moles \label{4.5.2}\], \[ V_{mL} M_{mmol/mL} = \cancel{mL} \left( \dfrac{mmol} {\cancel{mL}} \right) = mmoles \label{4.5.3}\]. B Because each formula unit of NaOH produces one Na+ ion and one OH− ion, the concentration of each ion is the same as the concentration of NaOH: [Na+] = 0.21 M and [OH−] = 0.21 M. B The only solute species in solution is therefore (CH3)2CHOH molecules, so [(CH3)2CHOH] = 3.7 M. \( In(NO _3 ) _3 (s) \xrightarrow {H_ 2 O(l)} In ^{3+} (aq) + 3NO _3^- (aq) \). Solution Polyescape - Pack Basic - Niveau 5 zoneasoluces.fr. 9.74 = - log (Ka) Loading... Unsubscribe from TyYann? These concentrations and their units are summarized in Table \(\PageIndex{1}\). Figure \(\PageIndex{1}\) illustrates this procedure for a solution of cobalt(II) chloride dihydrate in ethanol. Remember that diluting a given quantity of stock solution with solvent does not change the number of moles of solute present. Because the solute occupies space in the solution, the volume of the solvent needed is almost always less than the desired volume of solution. Traductions en contexte de "find a solution" en anglais-français avec Reverso Context : to find a peaceful solution, to find a political solution, efforts to find a solution, to find a lasting solution, in order to find a solution A We must first calculate the number of moles of glucose contained in 500 mL of a 0.310 M solution: \( 500\: \cancel{mL} \left( \dfrac{1\: \cancel{L}} {1000\: \cancel{mL}} \right) \left( \dfrac{0 .310\: mol\: glucose} {1\: \cancel{L}} \right) = 0 .155\: mol\: glucose \). (D5W is an approximately 5% solution of dextrose [the medical name for glucose] in water.) Ka for acetic acid is 1.78 x 10-5? The reason being that urea is a constituent of both intra- and extra-cellular fluid. To find the number of moles of \(\ce{CoCl2•2H2O}\), divide the mass of the compound by its molar mass. Diluting a stock solution is preferred because the alternative method, weighing out tiny amounts of solute, is difficult to carry out with a high degree of accuracy. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. For example, if the desired volume were 1.00 L, it would be incorrect to add 1.00 L of water to 342 g of sucrose because that would produce more than 1.00 L of solution. Unit 5: Unit 7 Unit 8 Unit 9 Unit 10 Unit 11: Unit 13 Unit 14 Unit 15 Unit 16 Unit 17: Unit 19 Unit 20 Unit 21 Unit 22 Unit 23: Unit 25 Unit 26 Unit 27 Unit 28 Unit 29: Unit 31 Unit 32 Unit 33 Unit 34 Unit 35 Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution. What ingredients must the solution contain? \nonumber \]. A The D5W solution in Example 4.5.3 was 0.310 M glucose. 5.70 = - log [OH-] At level 4 a particular scientific principle or effect has never been used before to deliver some particular fu… Knowing the concentration of solutes is important in controlling the stoichiometry of reactants for solution reactions. \nonumber \], Molarity is the number of moles of solute per liter of solution, so the molarity of the solution is, \[ molarity = \dfrac{0.0603\: mol} {0.500\: L} = 0.121\: M = CoCl_2 \cdot H_2O Level 1: LIKE ... Floors Escape Level 9 - Solution Walkthrough - Duration: 2:32. [OH-] = 10-pOH or [OH-] Some peoples are still having problems, Now tell me if someone asks you randomly what is 4+5? When carrying out a chemical reaction using a solution of a salt such as ammonium dichromate, it is important to know the concentration of each ion present in the solution. The pKa is calculated using the expression: where "Ka" is the equilibrium constant for the ionization Have questions or comments? The units of molarity are therefore moles per liter of solution (mol/L), abbreviated as \(M\). B We must now determine the volume of the 3.00 M stock solution that contains this amount of glucose: \[ volume\: of\: stock\: soln = 0 .775\: \cancel{mol\: glucose} \left( \dfrac{1\: L} {3 .00\: \cancel{mol\: glucose}} \right) = 0 .258\: L\: or\: 258\: mL \]. that has a pOH of 5.70? The question asks us to find the sum of the integer values of x that satisfy the inequality. Obtain the mass of glucose needed by multiplying the number of moles of the compound by its molar mass. Solutions of level 4 result from creating radically new functions on the basis of a scientific principle discovered at level 5. Each measurement can be expressed as a percentage by multiplying the ratio by 100; the result is reported as percent m/m or percent m/v. Find out (OH-) concentration in pH= 3.28 solution (1) 5.3 x 10-4 sulle to (2) 5.3 x 10-10 (3) 1.8 x 10-10 (4) 1.8 x 10\" TT ion concentration is 0.0025 M. Thus: pH = - log (0.0025) = - ( - 2.60) = 2.60. ~ Free Word Game is the full name of this fun and addicting trivia quiz game that’s taking the app stores by storm. It requires calculating the number of moles of solute desired in the final volume of the more dilute solution and then calculating the volume of the stock solution that contains this amount of solute. The solution shown in Figure \(\PageIndex{2}\) contains 90.0 g of (NH4)2Cr2O7 in enough water to give a final volume of exactly 250 mL. Level 189: To find the bull, take the “red” out of “Reddit” and put it out in the middle of the question to make the bull charge out, since bulls charge when they see red. Example \(\PageIndex{4}\) demonstrates the calculations involved in diluting a concentrated stock solution. Example: What is the hydroxide ion concentration in a solution Example \(\PageIndex{1}\): Calculating Moles from Concentration of NaOH. The game is created by Smart Games Studios for Android and iOS devices and comes as a free download. Veuillez trouver ci-dessous tous les Solution Pro Des Mots Défi Quotidien 5 Aout 2018 Niveau 1 solutions. 4.5 > x. This procedure is illustrated in Example \(\PageIndex{3}\). Concentrations are also often reported on a mass-to-mass (m/m) basis or on a mass-to-volume (m/v) basis, particularly in clinical laboratories and engineering applications. Enrich your vocabulary with the … On a calculator calculate 10-9.74, or "inverse" log ( - 9.74). Calculate the number of moles of sodium hydroxide (NaOH) in 2.50 L of 0.100 M NaOH. Brain out: Please write down a 2 digit number according to the picture. A stock solution is a commercially prepared solution of known concentration and is often used for this purpose. of the acid. Solution concentrations are typically expressed as molarities and can be prepared by dissolving a known mass of solute in a solvent or diluting a stock solution. -5.70 = log[OH-] Here is the full list Word Find answers and solutions for all levels. Kb, for aniline if the pKb is 9.38. To calculate the pH of an aqueous solution you need to know the concentration Thus 1 mol of ammonium dichromate formula units dissolves in water to produce 1 mol of Cr2O72− anions and 2 mol of NH4+ cations (see Figure \(\PageIndex{4}\)). In chemistry, the concentration of a solution is the quantity of a solute that is contained in a particular quantity of solvent or solution. Modified by Joshua Halpern (Howard University). By substituting - and, subsequently, this can be rewritten as a quadratic equation, and solved as such: We are looking to factor the quadratic expression as , replacing the two question marks with integers with product and sum 5; these integers are . The Ka for an acid is calculated from the pKa What is the Find the concentration of each species by multiplying the number of each ion by the molarity of the solution. A Classify each compound as either a strong electrolyte or a nonelectrolyte. The most common unit of concentration is molarity, which is also the most useful for calculations involving the stoichiometry of reactions in solution. An aqueous solution that contains 1 mol (342 g) of sucrose in enough water to give a final volume of 1.00 L has a sucrose concentration of 1.00 mol/L or 1.00 M. In chemical notation, square brackets around the name or formula of the solute represent the molar concentration of a solute. there are … A solution of a desired concentration can also be prepared by diluting a small volume of a more concentrated solution with additional solvent. To prepare a particular volume of a solution that contains a specified concentration of a solute, we first need to calculate the number of moles of solute in the desired volume of solution using the relationship shown in Equation \(\ref{4.5.2}\). the Hydroxide Ion Concentration from pOH. If the compound is a strong electrolyte, determine the number of each ion contained in one formula unit. Consultez la Solution 5 Indices Niveau 3, ne restez plus bloqué et trouvez grace à JEU .info toutes les réponses et astuces pour terminer le jeu. Use either Equation \ref{4.5.2} or Equation \ref{4.5.3}, depending on the units given in the problem. Calculate the number of moles of glucose contained in the specified volume of solution by multiplying the volume of the solution by its molarity. Level 190: To correct 4+5=19, put your finger over the 1 for five seconds in order to hide the one, and change the equation to 4+5… Le but ici est de créer un rectangle à partir de formes diverses. Find the Five Numbers Solution TyYann. to find a solution definition in English dictionary, to find a solution meaning, synonyms, see also 'find out',find oneself',find the lady',find fault (with)'. Given: volume and molarity of dilute solution. 2 volunteers will be able to complete 12 auction galleries. Escape Challenge Niveau 5 - Level 5 Walkthrough - astuces et trucs fr Astuces Trucs. 6 tables/hour * 3 hours = 18 tables/hour. Click the above link for a detailed image hint. If one volunteer can setup 18 in 3 hours, then 10 volunteers will take care of the 180 tables. Pour les autres niveaux, cliquez ici >> Solution complète Brain Out Brain Out Niveau 5 Sur l’écran, on peut voir 5 formes : un cercle vert, une forme rouge, une étoile bleue, une forme jaune et un carré orange. that has a pH of 8.34? Answer is 4+5=9, Answer is 9. 9.38 = - log (Kb) B One formula unit of In(NO3)3 produces one In3+ ion and three NO3− ions, so a 0.032 M In(NO3)3 solution contains 0.032 M In3+ and 3 × 0.032 M = 0.096 M NO3–—that is, [In3+] = 0.032 M and [NO3−] = 0.096 M. \([Ba^{2+}] = 0.0012\: M; \: [OH^-] = 0.0024\: M\), \([Na^+] = 0.34\: M; \: [SO_4^{2-}] = 0.17\: M\). Brain Out Game Level 75 is Solved on this page, With detailed image and text hints. = antilog ( - pOH). The pKb is calculated using the expression: where Kb is the equilibrium constant for the ionization of What is the molar concentration of ammonium dichromate? Find the Words! 5) Pick the Best Solution to Solve Your Challenge. When carrying out a chemical reaction using a solution of a salt such as ammonium dichromate, it is important to know the concentration of each ion present in the solution. pKb = - log (4.4 x 10-4) = - ( - 3.36) = 3.36. Example: Calculate the value of the ionization constant The concentration of a substance is the quantity of solute present in a given quantity of solution. Kb = 10-9.38 = 4.17 x 10-10. Sodium hydroxide is an ionic compound that is a strong electrolyte (and a strong base) in aqueous solution: On a calculator calculate 10-9.38, or "inverse" log ( - 9.38). Given: mass of solute and volume of solution. Another solution commonly used for intravenous injections is normal saline, a 0.16 M solution of sodium chloride in water. Try to think about what your issue involves. Brain Out Level 216 Solution. The hydroxide ion concentration can be found from the pOH by the Given: molarity, volume, and molar mass of solute. The HCl is a strong acid and is 100% ionized in water. The pH and pOH of a water solution at 25oC are related by … the value of Kb for methyl amine is 4.4 x 10-4? If a solution contains 1.43 M (NH 4 ) 2 Cr 2 O 7 , then the concentration of Cr 2 O 7 2− must also be 1.43 M because there is one Cr 2 O 7 2− ion per formula unit. Consequently, the concentration of the solute must decrease by about a factor of 10, as it does (3.00 M → 0.310 M). [ "article:topic", "concentration", "Parts per million", "parts per billion", "molarity", "stock solution", "showtoc:no", "license:ccbyncsa" ], is defined as the number of moles of solute present in exactly 1 L of solution, is a commercially prepared solution of known concentration and is, 4.6: Solution Stoichiometry and Chemical Analysis, information contact us at info@libretexts.org, status page at https://status.libretexts.org, To describe the concentrations of solutions quantitatively. Brain Out Find 5 stars. For example, when trying to find a solution to a Wi-Fi related issue, you will be able to find a solution under the "Network" category. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. 4 > 2x – 5. find vs. find out clues; If this is your first visit, be sure to check out the FAQ by clicking the link above. I want to host a website or … Voici la solution Brain Out du niveau 5. Define the parameters clearly. Add 2x to both sides. Calculate the mass of sodium chloride needed to prepare 250 mL of normal saline solution. Cancel Unsubscribe. Consultez la Solution 5 Indices Niveau 5, ne restez plus bloqué et trouvez grace à JEU .info toutes les réponses et astuces pour terminer le jeu. Ammonium dichromate is an ionic compound that contains two NH4+ ions and one Cr2O72− ion per formula unit. L’objectif demandé est de construire un rectangle. Find out why Close. What is the molar concentration of \(\ce{CoCl2•2H2O}\)? Ka = 10-9.74 = 1.82 x 10-10. Anyone who has made instant coffee or lemonade knows that too much powder gives a strongly flavored, highly concentrated drink, whereas too little results in a dilute solution that may be hard to distinguish from water. As we have noted, there is often more than one correct way to solve a problem. Dilution is also used to prepare solutions from substances that are sold as concentrated aqueous solutions, such as strong acids. This means that the values of x that satisfy the original quality must be greater than -0.5 AND less than 4.5. Figure \(\PageIndex{1}\) illustrates the use of Equations \(\ref{4.5.2}\) and \(\ref{4.5.3}\). The solution contains 10.0 g of cobalt(II) chloride dihydrate, CoCl2•2H2O, in enough ethanol to make exactly 500 mL of solution. You may have to register before you can post: click the register link above to proceed. 4 – 2x > –5. New; The pOH is then calculated using the expression: Example: What is the pOH of a solution that has Once you've chosen between the Student or Employee option from the main page, you will find a list of categories to choose from. a base. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. The concentrations of very dilute solutions are often expressed in parts per million (ppm), which is grams of solute per 106 g of solution, or in parts per billion (ppb), which is grams of solute per 109 g of solution. The pH is then calculated using the expression: Example: Find the pH of a 0.0025 M HCl solution. What volume of a 5.0 M NaCl stock solution is necessary to prepare 500 mL of normal saline solution (0.16 M NaCl)? 9 > 2x. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. In Example \(\PageIndex{2}\), the concentration of a solution containing 90.00 g of ammonium dichromate in a final volume of 250 mL were calculated to be 1.43 M. Let’s consider in more detail exactly what that means. of the hydroxide ion in moles per liter (molarity). \[(NH_4)_2Cr_2O_7 = 1.43\: M Calculate the number of moles of glucose contained in the indicated volume of dilute solution by multiplying the volume of the solution by its molarity. Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution. Find more ways to say find the solution, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. We begin by using Equation 4.5.4 to calculate the number of moles of glucose contained in 2500 mL of the solution: \[ moles\: glucose = 2500\: \cancel{mL} \left( \dfrac{1\: \cancel{L}} {1000\: \cancel{mL}} \right) \left( \dfrac{0 .310\: mol\: glucose} {1\: \cancel{L}} \right) = 0 .775\: mol\: glucose \]. Example: Find the pH of a 0.0025 M HCl solution. However, there are two NH4+ ions per formula unit, so the concentration of NH4+ ions is 2 × 1.43 M = 2.86 M. Because each formula unit of (NH4)2Cr2O7 produces three ions when dissolved in water (2NH4+ + 1Cr2O72−), the total concentration of ions in the solution is 3 × 1.43 M = 4.29 M. What are the concentrations of all species derived from the solutes in these aqueous solutions? Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Word Find Answers Easy Pack Levels 1-50. The molar mass of CoCl2•2H2O is 165.87 g/mol. Just scroll below to find it.. Example: What is the pKb for methyl amine, if The relationship between the volume and concentration of the stock solution and the volume and concentration of the desired diluted solution is therefore, \[(V_s)(M_s) = moles\: of\: solute = (V_d)(M_d)\label{4.5.4}\]. Solutions of known concentration can be prepared either by dissolving a known mass of solute in a solvent and diluting to a desired final volume or by diluting the appropriate volume of a more concentrated solution (a stock solution) to the desired final volume. pKa = - log (1.78 x 10-5) = - ( - 4.75) = 4.75. Brain Out Level 214 Solution (Click Here to get detailed Hints): you can find 5 from the normal one, the last one is to Drag down on the corner smile and click that smile at the last. for the ammonium ion, Ka, if the pKa is 9.74. Calculate the molarity of the solution by dividing the number of moles of solute by the volume of the solution in liters.

Qu'est Ce Que La Mecque, Travaux Ligne J été 2020, Résidence Soko-eder Ciboure, Roman Policier 2020 Poche, Budapest En Amoureux, Location Voiture Porto, Garou - Sous Le Vent, Serge Gainsbourg Jane Birkin, équipe Pays-bas 2012,

## Commentaires récents