Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms insoluble precipitates with calcium and magnesium ions, removing them from solution. Suppose that a solution is 5.5×10-2 M in calcium chloride and 7.5×10-2 M in magnesium nitrate.
What mass of sodium phosphate would have to be added to 1.5Lof this solution to completely eliminate the hard water ions? Assume complete reaction.