Quiz+5+Solutions (1)

Quiz+5+Solutions (1) - a of HF is 3.0? (4 pts) HF H + +...

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12/4/09 Quiz 5 (7 pts) 1. What is the precise, general mathematical definition of pH? (1 pt) pH = -log a H+ 2. What is the pH of a 1 mM NaOH solution? (2 pts) [OH-] = 0.001M [H + ] = 10 -14 / [OH-] = 10 -11 M pH = -log [10 -11 ] = 11 3. What is the pH (to one decimal point) of a 0.1 M solution of HF at 298K, assuming the pK
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Unformatted text preview: a of HF is 3.0? (4 pts) HF H + + F-Initial 0.1M Change-x +x +x Equilibrium 0.1-x x x K a = [H + ] eq [F-] eq /[HF] eq K a = x 2 /(0.1-x) K a = 10-pKa = 10-3 0.001 = x 2 /(0.1-x) x 2 + 0.001x 0.0001 = 0 x = 0.0095 M = [H + ] pH = -log(x) = 2.0...
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This note was uploaded on 02/21/2011 for the course MSE 231 taught by Professor Bedford during the Spring '10 term at University of Michigan.

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