Topic 10 Solubility

Question 1

Solvent

Answer 1

A liquid in which the solute dissolves

Question 2

Solute

Answer 2

Soluble substance which dissolves

Question 3

Solution

Answer 3

A mixture of a solute dissolved in a solvent

Question 4

Insoluble

Answer 4

A substance that will not dissolve in a particular solvent

Question 5

Saturated solution

Answer 5

A solution in which no more solid will dissolved at a particular temperature

Question 6

What happens when a saturated solution is heated then cooled?

Answer 6

Some of the solute will be deposited

Question 7

Solubility

Answer 7

The mass of solid that will saturate 100g water/solvent at a particular temperature

Question 8

Calculation for solubility

Answer 8

Mass of solute/ mass of solvent x 100

Question 9

What happens to solids’ solubility when temperature is increased?

Answer 9

Solubility also increases

Question 10

What happens to gases’ solubility when temperature is increased?

Answer 10

Solubility decreases

Question 11

How do you draw a solubility graph?

Answer 11

Temperature on x axis (oC), solubility on y axis (g/100g), draw a curved line to connect the points

Question 12

EXPERIMENT how do you determine the solubility of a solid?

Answer 12

1. 10cm3 of water in boiling tube
2. Add sodium chloride and stir until excess is present
3. Decant saturated solution into a weighed evaporating basin
4. Weigh basin with solution inside
5. Evaporate until it starts to spit
6. Complete drying over water bath. To ensure drying is complete, heat and weigh until there is no change in mass.

By finding the solute and solvent mass using these results we can figure out the solubility of the solid