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# Solutions (Grade 10)

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## Solutions

1.
Based on the solubility curve shown below, how does the solubility of KI (s) change as the temperature decreases?
1. The solubility decreases.
2. The solubility increases.
3. The solubility remains the same.
4. The solubility increases and decreases.
2.
A saturated solution of which of the following is least soluble at 20ºC?
1. KI
2. NaCl
3. KCl
4. $KClO_3$
3.
At 100ºC, how many grams of NaCl are necessary to create a saturated solution?
1. 20 g
2. 30 g
3. 40 g
4. 50 g
4.
A solution of NaCl contains 68 g of NaCl in 200 g of water at 100ºC. How many more grams of NaCl need to be added to create a saturated solution at this temperature?
1. 12 g
2. 2 g
3. 22 g
4. 32 g
5.
How can a solution containing 125 g of KI dissolved in 100 g of water at 10ºC be classified?
1. saturated
2. unsaturated
3. supersaturated
4. none of the above
6.
How many grams of ammonia must be dissolved in 50 g of water to create a saturated solution?
1. 8 g
2. 16 g
3. 4 g
4. 24 g
7.
A solution containing which of the following would be affected by a change in pressure?
1. CO (g)
2. KCl (s)
3. NaCl (s)
4. KF (s)
8.
Which of the following conditions is sufficient to increase the solubility of a solid in water?
1. high pressure, only
2. low temperature and low pressure
3. low temperature and high pressure
4. high temperature
9.
Name one solution that is less soluble than NaCl is at 90ºC.

10.
At 5ºC, compare the masses required to create a saturated solution of ammonia and to create a saturated solution of sodium nitrate.

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