Page 276 - Chemistry eBook

Solubility and Temperature
• In solids and liquids: When the temperature increases, the solubility increases.
• In gases: When the temperature increases, the solubility decreases.
Reffy, Table G (p. 3) shows that temperature affects solubility:
• When the substance’s line shows the temperature
increasing as the solubility increases, you know
that the substance is a solid or liquid.
• When the substance’s line shows the temperature
increasing as the solubility decreases, you know the substance is a gas.
Think sugar in hot tea. The hotter the tea, the more easily the sugar dissolves.
Think cold, closed soda. Soda is juice and gas (fizz) mixed together. When you move a can of Coke from the fridge to your counter, the
fizz starts escaping. This happens because when the temperature of
a gas increases (such as when you take soda out of the fridge), the solubility decreases (and the soda cannot hold as much gas anymore).
275 © UNIT 7: SOLUTIONS / SOLUBILITY