Unit 6
Solutions.
Salt in water: dissolving, how much the water can hold, concentration in moles per litre, dilution, and separating mixtures.
Before this unit
The unit, lesson by lesson
Lessons
4 lessons · 20 practice questions · about 2 hours
Dissolving
What happens to salt that vanishes in water: solvent and solute, ions wrapped in water molecules, mass that is conserved, and what sets a solution apart from any mixture.
Solubility
How much salt water can hold: saturated solutions, solubility in grams per 100 grams of water, what stirring and heat do, and why gases dissolve less in warm water.
Concentration
How much solute is in each litre: concentration in grams per litre and moles per litre, how to make up a solution of a given concentration, and why the salt on the bottom does not count.
Dilution and separation
What changes when you add water to a solution and what stays the same, and how to take a mixture apart again: filtering, evaporation, crystallisation and distillation.