# Copper sulphate

How much g of water do we have to add to 240 g of an 84% CuSO4 solution to produce a 60% solution? (Express the mass of crystalline CuSO4 in the original solution and in the resulting solution and compare them. )

Correct result:

w =  96 g
m1 =  201.6 g
m2 =  201.6 g

#### Solution:

0.84•240 = 0.60 •(240+w)

0.6w = 57.6

w = 96

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