8.5 Solubility and Saturation

Video Solubility and solution types http://www.youtube.com/watch?v=VTmfQUNLlMY

Types of Solutions Saturated solution = a solution that is at its MAXIMUM solute concentration. The solution cannot dissolve any more solute. Unsaturated solution= a solution that contains LESS than the maximum solute it can hold. Supersaturated solution= a solution that contains MORE solute than it can normally hold.

Types of Solutions

Solubility Definition: The concentration of a saturated solution of a solute in a solvent at a specific temperature and pressure (usually SATP).

Solubility Curves A graph of the solubility of a solute over a range of temperatures. Each point on the curve represents the maximum amount of solute that will dissolve at that temperature. Remember: solubility= g of solute per 100 mL of water

Example: Solubility Curve of Potassium Nitrate

Solubility Curves of Ionic Compounds vs. Gases

Comparison of Ionic Compounds vs. Gases

How to use a Solubility Curve Saturated solution= point ON the curve Unsaturated solution= point BELOW the curve. The vertical difference between a point below the curve and a point on the curve represents the additional mass of solute/100 g of water that is required to saturate the solution. Supersaturated solution= point ABOVE the curve. The vertical difference between a point above the curve and a point on the curve represents the mass of solute/100 g of water that will crystallize in the solution.

Homework Read pp. 392 – 396 Answer p. 397 # 1 – 6