Question

Given that

Temperature 90^0 C 30^0C

Max amt of salt (grams that 35 g 12.5g
can disslve in 50g of water

55g of CuSO4 is dissolved in 100g of water at 90 degrees celsius. Is the solution saturated? The solution is evaporated to half its volume. At 90^0C, i the solution saturated? Why?

Answer 1

If I'm reading the table correctly, only 35g of salt will "fit" into 100g of water at 90DC. If you try to put in 55g, that's 20g more than the solution can hold, so the solution will become saturated, and you'll have 20g of undissolved CuSO4 sitting on the bottom of the beaker. If you then evaporate half the volume, you will force out half the solute, so the solution will still be saturated.

Answer 2

If I'm reading the table correctly, only 35g of salt will "fit" into 100g of water at 90DC. If you try to put in 55g, that's 20g more than the solution can hold, so the solution will become saturated, and you'll have 20g of undissolved CuSO4 sitting on the bottom of the beaker. If you then evaporate half the volume, you will force out half the solute, so the solution will still be saturated.