Solubility Grade 7 Science

Learning Goals Describe the difference between saturated and unsaturated solutions.

Review: Solutions are formed by a solute dissolving in a solvent Solute= small quantity Solvent= large quantity Soluble= able to dissolve in a specific solvent Insoluble= unable to dissolve in specific solvent

Concentrated vs. Dilute Solutions Concentrated Solution a solution with a large number of solute particles in a given volume of solution Dilute Solution a solution with a small number of solute particles in a given volume of solution

Concentration The amount of solute in a solution. The more solute dissolved, the greater the concentration. Eg. Let’s look at food colouring water.

Food Colouring 1. Put 1 drop of food colouring in cup 1. 2. Put 5 drops of food colouring in cup 2. 3. Put 20 drops of food colouring in cup 3. Describe how the concentration changes as you add more drops on your sheet, using scientific vocab.

Saturated vs. Unsaturated There is a limit on how much solute can be dissolved in a solvent. Saturated Solution a solution in which no more solute can dissolve Unsaturated Solution a solution in which more solute can be dissolved

Saturated vs. Insoluble Sometimes a solvent may seem insoluble, however, the solvent may just be saturated. The amount of solute added to a solvent is important, and must always be considered when talking about dissolving.

Solubility A measure of how much solute can dissolve in a certain solvent to form a saturated solution at a particular temperature.

Factors that affect Solubility The nature of the solute and solvent Temperature Pressure (gases only)