This document discusses solubility curves and how they are used to show the solubility of solids and gases in water at different temperatures. Solubility curves indicate the maximum amount of solute that can dissolve in a solvent, with points on the curve showing saturated solutions, above showing supersaturated, and below showing unsaturated. The document explains that for solids, solubility increases with temperature, while for gases solubility decreases with increasing temperature. Examples of solid and gas substances are provided.

1. Interpreting Solubility Curves
Unit 9: Solutions

2. What are solubility curves?
• Changing the temperature
and pressure changes the
amount of solute that can
dissolve.
• Solubility measures the
amount of solute dissolved
in a solvent at a certain
temperature
• Solubility curves show the
solubility (grams per 100g
of water) at different
temperatures

3. What are solubility curves?
• Points ON the curve
show saturated soln
• Points ABOVE the
curve show
supersaturated soln
• Points BELOW the
curve show
unsaturated soln

4. What is the solubility of solids?
• For solids…
• As temperature
increases solubility
increases
• As temperature
decreases solubility
decreases
• This is known as directly
proportional – they both
do the same thing!

5. What is the solubility of solids?
• Which substances are
solids?
– KNO3
– NH4Cl
– NaCl
– K2SO4
– KClO4

6. What is the solubility of gases?
• For gases…
• As temperature
increases solubility
decreases
• As temperature
decreases solubility
increases
• This is known as
inversely proportional –
they do DIFFERENT
things!

7. What is the solubility of gases?
• Which substance is a
gas?
– Li2SO4

8. Practice
• Can more sugar dissolve in tea when it is hot or
cold? Explain your reasoning.
• If it gets too hot on a summer day, why might
many fish die resulting in fish kills?