a3 - p H 9 buffer The buffer should have the largest...

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Chemistry 2000B Spring 2002 Assignment 3 Due: Thursday, March 7, noon The temperature in all questions in this assignment is 25 C. 1. 5.23 g of sodium hydrogen tartrate was dissolved in water and titrated with 1.53 M sodium hydroxide solution. The titration curve is shown below: 4 6 8 10 12 pH 0 5 10 15 20 25 30 35 V(OH) (mL) Determine the K a of the hydrogen tartrate anion. [5 marks] 2. 3.75 g of sodium nitrite is dissolved into 65 mL of 0.85 mol/L HCl. What is the final p H? [10 marks] 3. 3.75 g of sodium nitrate is dissolved into 65 mL of 0.85 mol/L HCl. What is the final p H? [4 marks] 4. 10.05 g of an unknown monoprotic acid is dissolved in water and titrated with 1.43 mol/L sodium hydroxide solution. It takes 94.40 mL of titrant to reach the equivalence point. Calculate the molar mass of the acid. [6 marks] 5. (a) Given solid ammonium chloride and 0.0435 mol/L ammonia solution, describe the preparation of approx- imately 1 L of
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Unformatted text preview: p H 9 buffer. The buffer should have the largest buffering capacity (highest concentration) possible given the reagents available. [10 marks] (b) Suppose that 5 mL of 0.20 mol/L sodium hydroxide solution is added to 50 mL of your buffer solution. What is the final p H? Report your answer to two decimal places. [10 marks] 6. 15 mL of a 0.043 mol/L solution of sodium dihydrogen phosphate is mixed with 25 mL of a 0.54 mol/L solu-tion of sodium hydrogen carbonate. What are the final concentrations of the major species in this mixture? [10 marks] Notes and hints: By “major species”, I mean any species whose concentrations are of a similar order of magni-tude to the reagents. Your first task will be to determine the reaction which might occur in this mixture. There’s a dilution involved here, so be a little careful when setting up your calculations....
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This note was uploaded on 03/03/2012 for the course CHEM 2000 taught by Professor Roussel during the Fall '06 term at Lethbridge College.

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