pb set 12 - Problem Set #12 Mixed Solutions and Buffers 1....

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Problem Set #12 – Mixed Solutions and Buffers 1. Explain what happens to (a) the concentration of H 3 O + ions in an acetic acid solution when solid sodium acetate is added; (b) the percentage deprotonation of benzoic acid in a benzoic acid solution when hydrochloric acid is added; (c) the pH of the solution when solid ammonium chloride is added to aqueous ammonia. 2. A solution of equal concentrations of lactic acid and sodium lactate was found to have pH = 3.08. (a) What are the values of pK a and K a of lactic acid? (b) What would the pH be if the acid had twice the concentration of the salt? 3. Determine the pH and pOH of a solution that is (a) 0.50 M NaHSO 4 (aq) and 0.25 M Na 2 SO 4 (aq); (b) 0.50 M NaHSO 4 (aq) and 0.10 M Na 2 SO 4 (aq); (c) 0.50 M NaHSO 4 (aq) and 0.50 M Na 2 SO 4 (aq). 4. The pH of 0.40 M HF(aq) is 1.93. Calculate the change in pH when 0.356 g of sodium fluoride is added to 50.0 mL of the solution. Ignore any change in volume. 5.
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This note was uploaded on 04/18/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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