Saturation and Crystallization Worksheet

Question 1

A salt’s solubility is 35 g per 100 g water at 25 °C. Which sample contains an unsaturated solution at that temperature?

1. 25 g dissolved in 100 g water
2. 35 g dissolved in 100 g water
3. 40 g dissolved in 100 g water
4. 45 g dissolved in 100 g water

Question 2

Explain what happens at equilibrium when 5 g more of the same solid is added to a saturated solution at constant temperature with no solvent added.

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Question 3

A clear supersaturated solution is seeded with a tiny crystal of its solute. What can happen?

1. The crystal turns the water into more solute.
2. Excess dissolved solute forms solid crystals.
3. The solution loses its dissolved solute completely.
4. The solubility must increase permanently.

Question 4

Explain why a solution described as saturated at one temperature can be unsaturated at another temperature.

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Question 5

Which tray is saturated at the stated equilibrium limit?

1. P
2. Q
3. R
4. All three

Question 6

Tray R reaches equilibrium without losing water. How much of the original dissolved salt forms solid crystals? Show your calculation.

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Question 7

How much additional salt can dissolve in tray P at this temperature?

1. 0 g
2. 7 g
3. 12 g
4. 45 g

Question 8

An equal mass of pure water is added to tray Q without changing temperature. Explain whether the resulting solution is saturated.

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