Chem 2 MIDTERM 1 Form A KEY

Chem 2 MIDTERM 1 - 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

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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. 2 NOCl (g)
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This note was uploaded on 02/27/2010 for the course CHEM 1132 taught by Professor Cole/clark during the Spring '08 term at UCM.

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Chem 2 MIDTERM 1 - 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

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