103B PS 4 - problem set 1 Page 1 CHEMISTRY 103B Sections 3-4 and 7-8 Problem Set 4 16 Points Answer Key Problem1(three points Thisdeals witha water

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problem set 1 4/10/2008 12:15:53 AM http://www.chem.arizona.edu/~kellerp/ps-answers/PS4an/PS4an.htm CHEMISTRY 103B, Sections 3-4 and 7-8 Problem Set 4: 16 Points Answer Key Problem1. ( three points ) Thisdealswitha water solutioninwhichthe initial concentration of the weak acidHA(aq) is0.50 mol/L. Theinitialconcentrationsof H 3 O + (aq) and A - (aq) are both zero. For thisacidK a = 7.0 x 10 -6 . HA(aq) H + (aq) A - (aq) Initial 0.50 0 0 Change -x +x +x Equilibrium [0.50 x] [x] [x] (a) Whatisthe equilibriumconcentrationof the weak acid? [HA} = 0.50 x = 0.50 0.0019 = 0.50 mol/L (two sigfigs) (b) Whatisthe equilibriumconcentrationof hydroniumion? [H + ] = x = 0.0019 mol/L (c) Whatisthe equilibriumconcentrationof the conjugatebase of the acid? [A - ] = x = 0.0019 mol/L Problem2. ( three points ) Thisproblemdealswitha water solutionof a weak base. The initialconcentrationof the base is0.010 mol/L. Theinitialconcentrationsof hydroxideion and the conjugateacidof the base are both zero. For thisbase K b = 6.0 x 10 -2 . B(aq)
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This note was uploaded on 04/10/2008 for the course CHEM 103B taught by Professor Keller during the Spring '08 term at University of Arizona- Tucson.

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103B PS 4 - problem set 1 Page 1 CHEMISTRY 103B Sections 3-4 and 7-8 Problem Set 4 16 Points Answer Key Problem1(three points Thisdeals witha water

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