Direction. Write your answer on a separate sheet of paper. For items involving calculation show your solution and box the final answer. 1. Calculate the ratio of CH3COOH/NaCH3COO to give a buffer solution at pH 5.

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Chapter1: Chemical Foundations
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Direction. Write your answer on a separate sheet of paper. For items involving calculation
show your solution and box the final answer.
1. Calculate the ratio of CH3COOH/NaCH3COO to give a buffer solution at pH 5.
2. What is the pH of the solution of 35.0 mL 0.20-M formic acid and 55.0 mL 0.10 M sodium
formate in 110 mL water? pKa formic acid = 3.57
3. How many grams of ammonia should be added to 500mL of 1M ammonium chloride to give a
pH 9? Ka ammonium = 5.6 x 10-10
Transcribed Image Text:Direction. Write your answer on a separate sheet of paper. For items involving calculation show your solution and box the final answer. 1. Calculate the ratio of CH3COOH/NaCH3COO to give a buffer solution at pH 5. 2. What is the pH of the solution of 35.0 mL 0.20-M formic acid and 55.0 mL 0.10 M sodium formate in 110 mL water? pKa formic acid = 3.57 3. How many grams of ammonia should be added to 500mL of 1M ammonium chloride to give a pH 9? Ka ammonium = 5.6 x 10-10
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