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Another important thing to note is that when a heterogeneous reaction has reactants or products indicated as solids or pure solvents (like H2O), we must write them as "1" when we are writing an expression for K or Q. For instance, in a heterogeneous reaction with an acid HA and H2O as reactants and H3O+ and A- as products, we write K as [H3O+][A-]/[HA]. I didn't include the concentration of water because it is a pure solvent, so leave it in the denominator as 1.
Sam McNeill 1E wrote:A homogenous equation includes substances where all of the phases are the same, for example all gases, and a heterogenous equation has a mixture of different phases.
Here's a couple of examples that I think illustrate this well:
homogeneous: N2 (g) +3 H2 (g) -> 2 NH3 (g)
heterogeneous: CaCO3 (s) -> CaO (s) + CO2 (g)
Heterogenous equations contain compounds with different (hetero) phases while homogenous equations contain the same (homo) phases. For example a chemical equation with all of the compounds in the gas phase is homogenous.
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