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Unformatted text preview: buffer. Identify specifically the number of moles needed to yield the desired pH of 5.1. (acetic acid and sodium acetate, K a = 1.8 x 10-5 for acetic acid) 7. How many moles of NaOH must be added to a 1.0 L solution of 2.0 M HC 2 H 3 O 2 (K a = 1.8 x 10-5 ) to produce a solution buffered at each of the following pH values? a. pH = pKa b. pH = 4.00 c. pH = 5.00 Individual Problems 1. Calculate the pH of a solution that is 0.60 M HF and 1.00 M HF. 2. What relative ratios of NH 4 Cl and NH 3 (K b = 1.8 x 10-5 ) are needed to achieve the following buffered pH values? a. 9.25 b. 9.61 c. 9.02 What is the working pH range for this buffer? 3. Using 1 L of the buffered solution in problem 1, calculate the pH observed after the following additions: a. 100 mL of 1.0 M HCl is added b. 100 mL of 1.0 M NaOH is added...
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- Fall '08