You know that silver chloride is not very soluble in water, but what do you know about its solubility in seawater? You decide to investigate the solubility of silver chloride in solutions with various concentrations of sodium chloride. Estimate the molar solubility of silver chloride in 10 * 10^–4 m NaCl(aq) at 25°C.

ANTICIPATE A common ion, Cl^–, is present, so you should expect the solubility of AgCl in NaCl(aq) to be lower than in pure water.

PLAN Set up the expression for the solubility product and solve for the concentration of silver ions.

What should you assume? Assume that the concentration of chloride ions from the AgCl is insignificant compared to the concentration of the chloride ions in the sodium chloride solution.