This lesson could be even discussed with more details. #A(aq)+B(aq)rightleftharpoonsC(aq)+D(aq)# Note that aqueous state is treated as gases, however, we don't calculate #K_P# in this case from pressures, therefore, we only find #K_c#: Thus, the equilibrium constant #K_c# expression is written as: Note that, if any of the reactants or products are in the liquid or solid states, these are not included in the expression of the equilibrium constant.įor example, consider the following general reaction: If the reactants and products are gases, we can also calculate the equilibrium constant using pressures, in this case the equilibrium constant is called #K_P#: The equilibrium constant of a reaction under the general form:Ĭan be calculated by the general expression of #K_(eq)# as follows:
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