Chemistry / Chem 1764 · Atom · ~20 seconds
Comparing Q to K Predicts Direction
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A reaction proceeds forward if Q is less than K, reverse if Q is greater than K, and is already at equilibrium if Q equals K.
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A reaction mixture with Q = 2 and K = 50 still has far to run forward before reaching equilibrium.
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Comparing Q to zero, instead of to K, gives no directional information at all.