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Writing Keq Writing the equilibrium constant is fairly easy, you can infer this from a few easy rules: The equilibrium constant is always a ratio of product concentration to reactant concentration. Products are by convention the things on the right hand side of the chemical equation. Product concentrations are always raised to the power given by the stoichiometric coefficients. By convention, the concentration of one is assigned to water for aqueous solutions. By convention a concentration of one is assigned to solids. Examples:   Note how the stoichiometric coefficient in the chemical equation becomes the exponent in the expression for the equilibrium constant.   Note how the concentration of the solid is taken as one.     Note how the concentration of the water is taken as one.

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