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Question

How much copper sulphate will be required to saturate 100 g of a dilute aqueous solution of CuSO4 at 25oC if 10 g of the dilute solution leave on evaporation and drying 1.2 g of anhydrous CuSO4 in water at 25oC is 25.

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Solution

100 g of dilute solution of CuSO4 contain
=1.2×10=12.0gCuSO4
Mass of water present in dilute solution
=(10012)=88g
To saturate 100 g of water, CuSO4 required =25g
So, to saturate 88 g of water, CuSO4 required =25100×88=22g
Thus, the mass of CuSO4 to be added to 100 g of dilute solution to saturate it =(2212)=10g.

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