Question

(a) Amina observed that crystals of copper sulphate are formed in the solution, when a
saturated solution of copper sulphate has cooled. Will the solution be still remained as
saturated? Why?
(b) Calculate the mass of sodium sulphate required to prepare its 20% ( mass by mass
%) solution in water, if mass of the solution is 80 g .
Answer asap please! ​
Chapter: is matter around us pure? ​

Answer 1

Explanation:

100 g of dilute solution of CuSO

4

contain

=1.2×10=12.0gCuSO

4

Mass of water present in dilute solution

=(100−12)=88g

To saturate 100 g of water, CuSO

4

required = 25 g

So, to saturate 88 g of water, CuSO

4

required =

100

25

×88=22g

Thus, the mass of CuSO

4

to be added to 100 g of dilute solution to saturate it =(22−12)=10g.