 # Solubility Curves

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A series of free IGCSE Chemistry Activities and Experiments (Cambridge IGCSE Chemistry).

Effects of Temperature on Solubility
Saturated solution - When a maximum amount of the solute is dissolved.
Unsaturated solution - When less than a maximum amount of the solute is dissolved.
When saturation has been reached - Rate of dissolving = Rate of crystalisation.

Interpreting Solubility Curves
How to read a solubility curve?
Example:
Refer to graph to answer the following questions:
1. What mass of Ammonium Chloride will dissolve at 50°C in 100 g of water?
2. What is less soluble in 100 g of water at 10°C sodium nitrate or sodium chloride?
3. Will 100 g of potassium nitrate at 50°C in 100 g of water create a saturated solution? or unsaturated solution?
4. 10 g of which substance will dissolve at 90°C in 100 g of water?

Exercise:
Refer to graph to answer the following questions:
1. What mass of Sodium Chloride will dissolve at 90°C in 100 g of water?
2. What mass of Potassium Nitrate will dissolve at 20°C in 100 g of water?
3. What mass of Potassium Chromate will dissolve at 50°C in 200 g of water?
4. What temperature is necessary for 65 g of lead nitrate to dissolve in 100 g of water?
5. What temperature is necessary for 10 g of cerium sulfate to dissolve in 100 g of water?
6. in 100 g of water at 60°C will 50 g of potassium chloride be saturated or unsaturated?

Questions:
The solubility curves for potassium nitrate and five solids, A, B, C, D and E, are shown for the temperature range 0 °C to 100 °C. The solubility is given in grams of the solid that will dissolve in 100 grams of water. For each question, select from the graph the letter A, B, C, D or E that represents the solid described. (Each letter may be used once, more than once or not at all.)
1. Which solid has the lowest solubility at 60 °C?
2. Which solid has the same solubility as potassium nitrate at 52 °C?
3. Which solid has a solubility that changes least with temperature?
4. Which solid would give a deposit of 20 g if a saturated solution in 100 g of water at 60 °C was cooled to 20 °C?
5. Which solid would be deposited in the greatest mass if a saturated solution in 100 g of water at 100 °C was cooled to 80 °C?

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