1.

Calcuim and magnesium ion form a 10^5 litre of 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»

Degree of HARDNESS of water is 4 ppm
Molarity of `Ca^(2+)` ions in HARD water was `4xx10^(-5)M`
Molarity of `Mg^(2+)` ions in hard water `4xx10^(-5) M`
SUM of molarity of `Ca^(2+)` & `Mg^(2+)` ions in hard water was `6xx10^(-5) M`

Solution :`underset(AG)(CaCO_3)+underset((568a-g))(MgCO_3)`
`44/100xxa+44/84xx(568-a)=264`
or a=400 g


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