Part A: Calculations for Solution Preparation d. Calculate the mass of solid malonic acid (CH(COOH)2) necessary to prepare 50.0 mL of a 0.15 M (CH2(COOH)2) solution. b. Calculate the mass of solid manganese sulfate monohydrate (MnSO4 H2O) necessary to prepare 50.0 mL of a 0.020 M manganese ion (Mn *)..