Calcium and magnesium ion from a 105 litre sample of hard

Last updated: 8/5/2022

Calcium and magnesium ion from a 105 litre sample of hard water was quantitatively precipitated as carbonates and weight of ppt obtained was found to be 568 g. Precipitate lost 264 g of weight on strong heating (A) Degree of hardness of water is 4 ppm (B) Molarity of Ca2+ ions in hard water was 4 x 10-5 M (C) Molarity of Mg2+ ions in hard water was 4 x 10-5 M (D) Sum of molarity of Ca2+ and Mg2+ ions in hard water was 6 x 10-5 M