Common ion effect lab4/5/2024 Let's consider our saturated solution of Ca(OH) 2 from the last page. The type of equilibrium we are considering in this unit is the equilibrium between a mineral (crystalline salt) in water with the aquated anions. If one of these is added from some other source in the reaction, the ration of the others will adjust until the ratio Q again equals K eq. The concentration values of A, B, C, and D are the total concentrations from all sources. The value of Q at this point is the equilibrium constant, K eq. At the lowest energy point, the rate of the forward reaction will equal the rate of the reverse reaction. The system will always seek the lowest possible energy. Q varies as the forward and reverse reactions proceed and, at each value of Q, the system has a specific energy content. The ratio of the concentrations of products and reactants is called Q. There is a certain initial concentration of A, B, C, D. Consider a reversible reaction: A + B C + D.
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