1. Quiz – Solubility Graph Review
What is the solubility in water, at 25oC for:
KCl
KNO3
2) What is the mass % of the following solutions:
KClO3 @ 60oC
Li2SO4 @ 80oC
3) Describe a solution of 63 g of NH4Cl dissolved
in 150 g of water at the following temperatures:
A) 20oC
B) 40oC

2. 1) From the graph, the solubilities in water
at 25oC are:
A) KCl 35 g / 100 g H2O
B) KNO3 39 g / 100 g H2O

3. 2) From the graph, the solubilities in water are:
A) KClO3 @ 60oC, 25 g / 100 g H2O
B) Li2SO4 @ 80oC, 31 g / 100 g H2O
A) Mass % = 25 g / (100 g + 25 g) = 20 %
B) Mass % = 31 g / (100 g + 31 g) = 24 %

4. 3) 63 g NH4Cl = 42 g NH4Cl
150 g H2O g H2O
From the graph, the solubility of NH4Cl
in water is approximately 42 g / 100 g H2O
at 30oC.
Therefore, the solution would be:
A) supersaturated at 20oC
B) unsaturated at 40oC