Question

Calcium and magnesium ion from a 10^5 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​

Answer 1

Answer:

here is your answer

Explanation:

Degree of hardness of water is 4 ppm

Molarity of Ca2+ ions in hard water was 4×10−5M

Molarity of Mg2+ ions in hard water 4×10−5M

Sum of molarity of Ca2+ & Mg2+ ions in hard water was 6×10−5M

Answer :

B,D

Solution :

CaCO3ag+MgCO3(568a−g)

44100×a+4484×(568−a)=264

or a=400 g