Answer the given question below:
1. In the laboratory Keerthi dissolves 7g of \(CuSO_4\) in 100 mL of water. Sara dissolves 20g of \(CuSO_4\) in 100 mL of water.
i. Who prepared the concentrated solution?
ii. What Keerthi can do to make the solution concentrated?
iii. What change occurs when some water is evaporated from the solution?