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Chem 2 MIDTERM 1 Form A KEY

Chem 2 MIDTERM 1 Form A KEY - Midterm 1 Exam Form A CHEM...

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Midterm 1 Exam Form A, CHEM 002 Fall 2008. (Chapters 2, 3, 4, 6, 7 and 8) Name: _________________________  Date: ____________ Please be sure the chemical equation(s) given in the question(s) below are balanced  before you attempt to answer the respective question(s).  1. Considering the information given for each of the conjugate acid-base pairs listed  below, which would be most suitable for preparing a solution buffered to a pH of  4.35? a) [HAc] = 0.15/[Ac - ] = 0.10; K a  = 1.8x10 -5 b) [HNO 2 ] = 0.11/[NO 2 - ] = 0.11; K a  = 4.5x10 -5 c)   [HAc] = 0.15/[Ac - ] = 0.15; K a  = 1.8x10 -5 d)   [HNO 2 ] = 0.31/[NO 2 - ] = 0.31; K a  = 4.5x10 -5 e)   [NH 4 + ] = 0.15/[NH 3 ] = 0.10; K a  = 5.6x10 -10 2. Calculate the equilibrium constant, K eq , for the balanced chemical reaction given  below. The initial concentrations of [NOCl] = 1.00, [NO] = 0.00 and [Cl 2 ] = 0.00; at  equilibrium, the concentration of [Cl 2 ] = 0.016.
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