Concentration and Solubility

Learning Goals / Success Criteria describe the concentration of a solution in qualitative and quantitative terms. describe the difference between saturated and unsaturated solutions. Key terms: concentrated solution, dilute solution, concentration, saturated solution, unsaturated solution

Concentration and Solubility The words “concentrated” and “dilute” are used to describe how much solute is in a certain volume of solution. 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 and Solubility

Calculating Concentration Concentration: the amount of solute present in an amount of solution The more solute dissolved, the greater the concentration. This concentration can be expressed in mathematical terms: Suppose 100ml of solution contains 5.0g of sugar. The concentration of sugar in that solution is 5.0g/100ml (a ratio!).

Calculating Concentration The following is the equation for calculating concentration: Concentration = mass of solute in grams ml of solution Practice: Suppose a solution contains 6.0g of sugar in 200ml of solution. What is the concentration of the sugar and water?

Saturated and Unsaturated Solutions What would happen if you were mixing Kool-Aid and you kept adding drink powder? Eventually, no more powder would dissolve and the solution would be saturated. Saturated solution: a solution in which no more solute can dissolve Unsaturated solution: a solution in which more solute can be dissolved

Solubility We now know there is a limit to the amount of solute that can dissolve in a solvent. Chemists call this amount solubility. Solubility: a measure of how much solute can dissolve in a solvent to form a saturated solution at a particular temperature and volume. Different solutes have different solubilities and different factors affect solubility