A student collected the following data while using the proceduredescribed in this module: 27.13 mL of 1.00 x 10^-2M EDTA soltuionwas required to reach the ErioT end point for titration of 25.00 mLof the sample water. After boiling and filtering 100.00 mL of thewater, the student diluted the filtrate to 100.0 mL with distilledwater. To titrate 25.00 mL of the diluted filtrate, 26.40 mL of2.00 x 10^-1 M EDTA solution was required. The studetn precipitatedthe Ca^2 ion as CaC2O4 from 75.00 mL of the water sample andremoved the precipitate by filtration. The student then adjustedthe water sample volume to 100.0 mL. To titrate 25.00 mL of thediluted filtrate, 7.43 of 1.00 x 10^-2 M EDTA solution was requiredCalculate the permanent water hardness in terms of total mmol ofCa^2 and Mg^2 ions.
