Table 1. Laboratory Data Sheet Time Volume EDTA Used Total Hardness * (min) (mL) (mg/L as CaCO3) 0 14.52 15 13.72 30 12.44 60 11.18 90 9.94 120 7.34 Calculate Total Hardness as follows Total Hardness (mg/ L as CaCO3) = A xB x 1000 ml Sample Used Where: A = mL of 0.01M EDTA titrant used B = mg CaCO; equivalent to 1.00 mL EDTA titrant (B = 1 in our case) mL Sample Used = 50 mL Data Analysis 1. Using Microsoft Excel, plot the concentration of Total Hardness (y-axis) versus time (x-axis)