Q for a reaction involving pure liquids and solids
CaCO3(s) CaO(s) + CO2(g)
Qc = [CaO][CO2]/[CaCO3]
But a pure solid always has the same concentration at
a given temperature!
Thus: Terms for pure solids (and liquids) are eliminated from
the reaction quotient.
Q’c = Qc x [CaCO3]/[CaO] = [CO2]
As long as some CaCO3 and CaO are present, the
reaction quotient equals the CO2 concentration!
heterogeneous
equilibria
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