posted by scilover .
CaCO3(s) <-> CaO(s) + CO2(g)
What would happen if CO2 was removed?
Would the reaction shift left? Does that mean CaCO3 increases and CaO and CO2 decrease ?
so if you remove the CO2, it tries to make more. shifts right.
This reaction is intereresting if one changes the temperature. The rightward reaction is endothermic, so think on that.
One other note, because the CaCO3 and CaO are solids they have no concentration, and are not in the expression for Keq, so adding, or removing either have no effect on equilibrium shifts.