formula: second pic

2. Calculate the total hardness of a sample if 10 mL of 0.01 M EDTA is required to reach the calmagite endpoint and 25 mL of sample is used in the analysis. 3. Calculate the carbonate and non-carbonate hardness of a sample if the total alkalinity is 130 mg/L as Caco, and the total hardness is 175 mg/L as CaCO3. 6. Calculate and report the hardness of your samples in mg/L as CaCO3. The hardness is calculated as: Hardness (EDTA) as mg/L Caco, A x B x 1000 where A is the titrant volume (mL), B is the conversion factor for converting between titrant volume (mL) and mg of CaCO3, and C is the sample volume (mL). The factor of 1000 converts mL to L