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    AQA CHEM4 Jan 11 quesion 3b(iii)

    In a container of volume 1.50dm3:
    CO+2H2 ------> CH3OH

    State the effect on the value of Kc of adding more H2 to the equilibrium.
    Answer is no effect, but how?
    I would have thought that more H2 would affect the equation ([H2] increases) so Kc decreses

    [H2] in your equilibrium should be squared.

    If H2 is added to the equilibrium mixture the equilibrium will shift to the left reducing the amounts of CO and H2 and increasing the amount of CH3OH until their concentrations in the equilibrium expression once again equal the value of Kc at that temperature
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