Mr Deighton
Science 8
Unit 1 Mix and Flow of Matter
Solubility Definitions and Video
Solubility is defined as the mass of a solute that can dissolve in a given amount of solute to form a saturated solution.
Solubility curves tell us what mass of solute will dissolve in 100g (or 100mL) of water over a range of temperatures.
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​Watch the following video on solubility curves: https://www.youtube.com/watch?v=6sJ6kWB_8ag
Assignment Outcomes
Learner Outcomes:
1. investigate the solubility of different materials, and describe their concentration (e.g., describe concentration in grams of solute per 100 mL of solution)
2. investigate and identify factors that affect solubility and the rate of dissolving a solute in a solvent (e.g., identify the effect of temperature on solubility; identify the effect of particle size and agitation on rate of dissolving)
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Report Card Outcomes:
1. Analyzes and solves problems through scientific reasoning
2. Understands and makes connections between concepts
Use the graph below to answer the following questions regarding solubility:
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For questions 1 – 4 an amount of solute is given, and a temperature is stated. If all of the solute could be dissolved in 100 g of water at the given temperature, would the resulting solution be unsaturated, saturated, or supersaturated?
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1. 60 g KCl at 70 °C _________
2. 10 g KClO3 at 60 °C _________
3. 80 g NaNO3 at 10 °C _________
4. 70 g CaCl2 at 20 °C _________
For questions 5 – 8 a solute and temperature are given. Tell how many grams of each solute must be added to 100 g of water to form a saturated solution at the given temperature.
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5. Pb(NO3)2 at 10 °C _________
6. NaCl at 20 °C _________
7. Ce2(SO4)3 at 50 °C _________
8. K2Cr2O7 at 50 °C _________
For questions 9 and 10 underline the solution that is more concentrated.
9. At 10 °C: a saturated solution of KNO3 or a saturated solution of CaCl2.
10. At 50 °C: a saturated solution of KNO3 or an unsaturated solution of NaNO3 consisting of 90 g of the solute dissolved in 100 g of water.
For questions 11 – 12, show your work and circle your final answer.
11. If 115 g KNO3 are added to 100 g of water at 35 °C, how many grams do not dissolve?
12.What mass of KCl would be needed to form a saturated solution if the KCl was dissolved in 200 g of water at 80 °C?
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