A student collected the following date while using the procedure described in this module: 27.13 mL of 0.01M EDTA solution was required to reach the Erio T end point for titration of 25.00 mL of the sample water.
After boiling and filtering 100.0 mL of the water, the student diluted the filtrate to 100.0 mL with distilled water. To titrate 25.00 mL of the diluted filtrate, 26.40 mL of 0.01M EDTA solution was required.
The student precipitated the Ca+2 ion as CaC2O4 from 75.0 mL of the water sample and removed the precipitate by filtration. The student then adjusted the water sample volume to 100.0 mL. To titrate 25.0 mL of the diluted filtrate, 7.43 mL of 0.01M EDTA solution was required.
(1) Calculate the total number of millimoles of Ca+2 and Mg+2 ions present in the titrated sample.
(2) Calculate the total water hardness, expressed in ppm of equivalent CaCO3
(3) Calculate the permanent water hardness in terms of total mmol of Ca+2 and Mg+2 ions.
(4) Express the permanent water hardness in terms of ppm of equivalent CaCO3-
(5) Calculate the temporary water hardness in terms of ppm of equivalent CaCO3-
(6) Calculate the number of millimoles of Mg+2 ions per liter of the water.