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# HW4 - Homework 4 Name 1 a Calculate the pH and the percent...

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Homework 4 Name: ________________ 1. a. Calculate the pH and the percent dissociation of 0.10 M butanoic acid, HC 4 H 7 O 2 (K a = 1.5 x 10 -5 ). b. Calculate the pH of a solution of 0.070 M sodium butanoate. c. Calculate the pH percent dissociation of 0.10 M butanoic acid in a solution containing 0.070 M sodium butanoate.

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2. Our blood is buffered by carbonic acid. What is the ratio of HCO 3 - to H 2 CO 3 in blood of pH 7.4? What is the ratio of HCO 3 - to H 2 CO 3 in blood of a person who just ran the marathon and has a blood pH of 7.1? 3. A 100.0 mL buffer solution is 0.175 M in HClO and 0.150 M in NaClO. a. What is the initial pH of the solution? b. What is the pH after the addition of 150.0 mg of HBr? (ignore changes in volume) c. What is the pH after the addition of 85.0 mg of NaOH?
4. Determine whether or not the mixing of each of the two solutions indicated below will result in a buffer. If it is a buffer solution, indicate the buffering range. a. 100.0 mL of 0.10 M NH 3 and 100.0 mL of 0.15 M NH 4 Cl b. 50.0 mL of 0.10 M HCl and 35.0 mL of 0.150 M NaOH c. 50.0 mL of 0.15 M HF and 20.0 mL of 0.12 M NaOH d. 175.0 mL of 0.10 M NH 3 and 150.0 mL of 0.12 M NaOH

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