You analyze the hardness in a water sample using the complexometric titration standard method APHA Method 2340C, and find that a 50 mL sample consumes 10.0 mL of theEDTA 0.00150

M to reach the end point. The Total Hardness of this sample is: Atomic weight of Ca=40 g/mol Molecular weight of CO32 =60 g/mol O 25 mg/L as CaCO3 D150 mg/L as CaCO3 - 60 mg/L as CaCO3 30 mg/L as CaCO3