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Changing the quantities of the reactants or products in a reversible reaction causes the equilibrium to shift so that the equilibrium constant remains ... um ... constant.

If the reaction is


A + B = C + D


then the equilibrium constant is [A][B] / [C][D]. If you add more A or B, then more A and B will be used up, and more C and D will be produced. If you add more C or D, then more C and D will be used up and more A and B will be produced.

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