CHAPTER 13: SOLUBILITY

Question 1

solubility definition

Answer 1

Maximum amount of solute that can be dissolved in a given quantity of
solvent (commonly 100g) at a certain temperature

Question 2

solute, solvent, solution

Answer 2

• solute: substance being dissolved
• solvent: liquid the solute dissolves in
• solution: solute dissolved in liquid

Question 3

saturated solutions

Answer 3

No more solute can be dissolved at a particular temp

Question 4

unsaturated solution

Answer 4

More solute can be dissolved at a particular temp

Question 5

supersaturated solution

Answer 5

• An unstable solution that contains more dissolved solute than a saturated.
• When disturbed, some of the solute will come out of the solution

Super solutions are prepared by heating a solvent, dissolving a LOT of solute and letting it cool slowly.

Adding a ‘seed crystal’ to the supersaturated solution after it has cooled causes the solute to ‘crystallise’ and come out of the solution.

Question 6

solubility + temp

Answer 6

• the solubility of a substance increases as temperature increases
• This is because at high temp, the solute and solvent have more energy to overcome the forces of attraction that hold the particles together

Question 7

crystallisation

Answer 7

• Cooling reduces the solubility of a dissolved solute to a point where not all the substance present is soluble
• When an unsaturated solution becomes saturated, crystals form
• Solubility curves can be used to predict how much compound will crystallise out of a solution as temperature decreases

Question 8

solubility of liquids and gases in water

Answer 8

Dissolving Solids - Solubility increases as temp increases

Dissolving Gases - Solubility decreases as temp increases

Dissolving Liquids - No clear trend in solubility as temp increases

Question 9

concentration units

Answer 9

• have two parts
• first part gives info on amount of solute
• second part gives info on the amount of solution