PS2 - CHEMISTRY 15 Fall 2009 Problem Set#2(due date...

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CHEMISTRY 15 Fall 2009 Problem Set #2 (due date TBA) (Neglect effects of ionic strength and assume that all activities are equal to concentrations. Your solution set should include all work leading to the answers.) 1. Consider a weak base, B, and its conjugate acid, BH + . Beginning with the expression for K b show that the acid dissociation constant for BH + can be expressed as w a b K K K = 2. Find the pH of a 1.5 × 10 -6 M solution of a strong diprotic base M(OH) 2 . [Ans : 8 .48] 3. Calculate the pH of a solution of lactic acid that is (a) 1.00 × 10 -1 M, (b) 1.00 × 10 -2 M, (c) 1.00 × 10 -4 M. The pK a of lactic acid is 3.86. [Ans: (a) 2.43 (b) 2.96 (c) 4.17] 4. Calculate the pH of a solution of sodium lactate that is (a) 1.00 × 10 -1 M, (b) 1.00 × 10 -2 M. The pK a of lactic acid is 3.86. [Ans: (a) 8.43 (b) 7.93] 5. Calculate the pH of the solution that results when 20.0 ml of 0.200 M formic acid are: a. diluted to 45.0 ml with distilled water [Ans: 2.42] b. mixed with 25.0 ml of 0.160 M NaOH solution
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PS2 - CHEMISTRY 15 Fall 2009 Problem Set#2(due date...

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