Solubility Curve Practice Questions
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1
2Chemistry 12
Solubility Curve Practice
1. Potassium alum (KAl(SO
)
∙12H
O) is used to stop bleeding in small cuts. The solubility of potassium
4
2
2
alum at various temperatures is given in the following table.
Solubility
Temperature (ºC)
(g/100 g water)
4
0
10
10
15
20
23
30
31
40
49
50
67
60
101
70
135
80
a) Plot this solubility curve of a piece of graph paper provided. Plot Temperature on the x–axis and the
solubility data on the y-axis.
b) From your graph, what would be the expected solubility of potassium alum at 67ºC? ___________________
c) What would be the expected solubility of potassium alum at 82ºC? ___________________
d) Look at the solubility data for potassium alum at 40ºC. Using this data, calculate the mass of potassium
alum that could dissolve in 60 g of water.
e) Suppose you tried to dissolve 10 g potassium alum in 50 g of water at 30ºC. Would you expect this
solution to be saturated or unsaturated?
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