![]() ![]() To simplify the reaction, it can be assumed that is approximately 0.1M since the formation of the chloride ion from the dissociation of lead chloride is so small. ![]() The equilibrium constant remains the same because of the increased concentration of the chloride ion. Notice that the molarity of Pb 2 + is lower when NaCl is added. For example, a solution containing sodium chloride and potassium chloride will have the following relationship: Contributions from all salts must be included in the calculation of concentration of the common ion. If the salts contain a common cation or anion, these salts contribute to the concentration of the common ion. If several salts are present in a system, they all ionize in the solution. The solubility products K sp's are equilibrium constants in hetergeneous equilibria (i.e., between two different phases).
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