@20*C solubility - 22g CuSO4 / 100g H2O

Question

@40*C solubility - 42g CuSO4 / 100g H2O

which is saturated and unsaturated
a. @20*C is 6g CuSO4 / 25g H2O
b. @20*C is 30g CuSO4 / 150g H2O
c. @40*C is 99g CuSO4 / 250g H2O

please show work thanks

Answer 1

You need to change all of these to g/100 g H2O.

a. 6g CuSO4 x (100 gH2O/25g H2O) = 24 g CuSO4/100 g H2O. At 20 C the solubility is 22 g/100 g; therefore, it is saturated.