C401Ch13LN2 - Ch 13: Chemical Equilibrium Part 2...

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Ch 13: Chemical Equilibrium Part 2 Heterogeneous Equilibria In all the rxns we've looked at so far, all the reactants and products were in the same phase, either gaseous or aqueous. If all reactants and products are present in the same phase, this is a homogeneous equilibria . Equilibria in which one or more reactants or products are present in a different phase are called heterogeneous equilibria . Look at the decomposition of calcium carbonate: Experimentally, the amount of CO 2 made does not depend on the amounts of CaO and CaCO 3 . Why? The concentration of a pure solid or pure liquid equals its density divided by its molar mass: Neither density nor molar mass is a variable, they are constant (for constant T). Thus the concentrations of solids and pure liquids are constant. So for the decomposition of CaCO 3 : As CaO and CaCO 3 are pure solids and have constant concentrations, this becomes: Therefore, we anticipate that the amount of CO 2 formed will not depend on the amounts of CaO and CaCO 3 present.
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C401Ch13LN2 - Ch 13: Chemical Equilibrium Part 2...

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