You are an inorganic chemist with an interest in compounds of silver. One of your tasks is to compile a table of solubility products for its compounds from a list of their molar solubilities. The molar solubility of silver chromate, Ag₂CrO₄, is 65 μmol · L^–1 at 25°C (so s = 6.5 * 10^–5). Estimate the value of K_sp for silver chromate at 25°C.

ANTICIPATE Because the molar solubility is low, you should expect K_sp to be very small.

PLAN First, write the chemical equation for the equilibrium and the expression for the solubility product. Calculate the molar concentration of each type of ion formed by the salt from the molar solubility and the stoichiometric relations between the species.

What should you assume? Assume that the salt dissociates completely in water and that the anion is not protonated by water.