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Homework Help: Equilibrium Constant of a Heterogeneous Reaction

  1. Jul 11, 2016 #1
    1. The problem statement, all variables and given/known data
    Write an expression for Kc for the following at equilibrium;
    CaCO3(s) + CO2(g) + H2O(l) ⇔ Ca2+(aq) + 2HCO3-(aq)

    2. Relevant equations
    K = [products]^(coefficients)/[products]^(coefficients)

    3. The attempt at a solution
    I know that pure solid and liquid substances should be set to 1 when calculating the equilibrium constant. However, I haven't encounter an equation before where both aqueous and gaseous substances are present. Does this effect how I should set up the equation for the equilibrium constant at all? Thank you for your time
  2. jcsd
  3. Jul 12, 2016 #2


    User Avatar

    Staff: Mentor

    You should use a partial pressure of the gas.
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