What was the molarity of CaCl2 in the solution when 9-Bone was dissolved in hydrochloric acid, giving 45.0 mL of solution containing the calcium chloride, CaCl2 and to precipitate the calcium ion from the resulting solution, an excess of potassium oxalate was added. The precipitate of calcium oxalate, CaC2O4, weighed 1.437 g.