Horvath Practice Problems 34 - where K = 1 23 × 10 2 Initial concentrations of A and B are each 1.00 M Determine the concentration of reactants and

8 ICE CHARTS One of the most important things to be able to do with the equilibrium constant is to calculate the concentration of prod- ucts and reactants at equilibrium given an initial concentration of reactants. These calculations can be aided through the used of an ICE chart. The “I” stands for initial concentration, the “C” stands for change in concentration, and the “E” stands for equilibrium concentration. Use of ICE charts are best illustrated by way of examples. Example 1 : Consider the reaction A ( aq ) + 2 B ( aq ) C ( aq ) , (8.1)

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Unformatted text preview: where K = 1 . 23 × 10 2 . Initial concentrations of A and B are each 1.00 M. Determine the concentration of reactants and products at equilibrium . We set-up our ICE chart A B C I 1 . 00 1 . 00 C − x − 2 x x E 1 . 00 − x 1 . 00 − 2 x x We now use the equilibrium constant, K = 1 . 23 × 10 2 = x (1 . 00 − x ) (1 . 00 − 2 x ) 2 (8.2) We can rearrange this to give 492 x 3 − 984 x 2 + 616 x − 123 = 0 (8.3) Unfortunately we are now faced with a cubic equation to solve. ICE CHARTS 33...
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