AssignmentFourKey - Take-Home Assignment #4 The intention...

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Take-Home Assignment #4 The intention of these problems is to provide experience in solving equilibrium problems. Equilibrium constants for all reactions may be found in the Appendices. Use ladder diagrams to help you simplify equilibrium problems. 1. Calculate the solubility of Zn 2 [Fe(CN) 6 ] in (a) distilled water, and (b) in 0.00010 M K 4 Fe(CN) 6 . For part (a), let the [Fe(CN) 6 4- ] be X. The [Zn 2+ ] is 2X and the K sp expression is (2X) 2 (X) = 4X 3 = 2.1 × 10 -16 Solving for X gives a value of 3.7 × 10 -6 . The solubility of Zn 2 [Fe(CN) 6 ] is the same as the concentration of Fe(CN) 6 4- ; thus, the molar solubility is X, or 2.1 × 10 -16 M. For part (b) we have two sources of Fe(CN) 6 4- ; that coming from the solubility of Zn 2 [Fe(CN) 6 ] and that already present in solution. Our problem, therefore, is (2X) 2 (X+ 1.0 × 10 -4 ) = 2.1 × 10 -16 Assuming that X + 1.00 × 10 -4 X and solving gives X as 7.2 × 10 -7 . The error in this assumption is 0.72%, which is small enough to ignore. The molar solubility is the amount of Fe(CN) 6 4-
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This note was uploaded on 04/02/2012 for the course CHEMISTRY 222 taught by Professor Mcdonald during the Fall '11 term at University of Illinois, Urbana Champaign.

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AssignmentFourKey - Take-Home Assignment #4 The intention...

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