Homework Set 12-2: Solubility Curves
Answer the following questions based on the solubility curve below.
1. Which compound is the least soluble in water at
20°C?
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2. How many grams of KCl can be
dissolved in 100 g of water at 80°C?
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3. At 40°C, how many grams of KNO3 can be
dissolved in 300 g of water?
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4. Which compound shows the least change in
solubility from 0°C – 100°C?
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5. At 30°C, 90 grams of NaNO3 is dissolved in
100 g of water. Is this solution saturated,
unsaturated, or supersaturated?
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6. A saturated solution of KClO3 is formed
from 100 grams of water. If the saturated solution is
cooled from 80°C to 50°C, how many grams of
KClO3 will fall out of solution?
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7. Which two compounds show a decrease in solubility from 0°C to 100°C? _______________________________
8. Which compound is the most soluble at 10°C? ____________________________________________________
9. Which compound is the least soluble at 90°C? ____________________________________________________
10. What temperature is required to dissolve 80 grams of KNO3 in 100 grams of water ? ____________________
11. At 50°C, how many grams of water is needed to dissolve 160g of KNO3? ______________________________
12. Which two substances have the same solubility at 78°C? __________________________________________
13. Determine if each of the following is unsaturated (U), saturated (S), or supersaturated (SS) (in 100 g of H2O).
a.
b.
c.
d.
e.
55g of NH3 at 20°C
10g of Ce2(SO4)3 at 10°C
125g of KNO3 at 60°C
80g of NH4Cl at 50°C
12g of NH3 at 90°C
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f. 70g of NaNO3 at 30°C
g. 20g of KClO3 at 50°C
h. 35g of NaCl at 100°C
14. Determine the solubility of each of the following. (in 100 g of H2O)
a.
b.
c.
d.
KNO3 at 70°C
NH4Cl at 90°C
KI at 20°C
KClO3 at 90°C
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