In reaction A(aq)+B(aq)<->C(aq), where will the reaction shift if water is added and the concentrations are decreased? Is there a shift?

1 Answer

  • 3 years ago
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    For the given reaction, K = [C]/[A][B]

    Now, if you have this equilibrium and you add water, suppose that you decrease each concentration by half. So, now, before equilibrium is re-established, the reaction quotient, Q is given by:

    Q = [C]/2 / [A]/2 [B]/2 or 2 K

    Because Q > K, the equilibrium will shift to the left, decreasing [C] and increasing the concentrations of A and B until equilibrium is re-established.

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