# ch17problems+answers - Page 1 1 Calculate the pH of a 1.0-L...

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1. Calculate the pH of a 1.0-L aqueous solution containing 0.40 mol of HF and 0.10 mol of HCl. (Ka for HF = 6.8 10 -4 ) a. 0.40 b. 1.0 c. 0.016 d. 2.6 e. 1.4 10 -3 2. Consider a solution containing 0.100 M fluoride ion and 0.126 M hydrogen fluoride. The concentration of hydrogen fluoride after addition of 5.00 mL of 0.0100 M HCl to 25.0 mL of this solution is _____ M . a. 0.107 b. 0.100 c. 0.126 d. 0.00976 e. 0.00193 3. Of the following, which solution has the greatest buffering capacity? a. 0.821 M HF and 0.217 M NaF b. 0.821 M HF and 0.909 M NaF c. 0.100 M HF and 0.217 M NaF d. 0.121 M HF and 0.667 M NaF e. They are all buffer solutions and would all have the same capacity. 4. Determine the pH of a solution prepared by dissolving 0.75 mol of NH 3 and 0.25 mol of NH 4 Cl in a liter of solution. K b = 1.8 10 -4 for NH 3 . a. 4.27 b. 8.78 c. 10.73 d. 5.22 e. 9.78 5. Consider the titration of 25.0 mL of 0.723 M HClO 4 with 0.273 M KOH. The H

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## This document was uploaded on 11/02/2011 for the course CHM 8227 at University of Florida.

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ch17problems+answers - Page 1 1 Calculate the pH of a 1.0-L...

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