Solutions And Crystalisation

Question 1

What is the solvent

Answer 1

Solvent: the liquid the solute is dissolving in.

Question 2

Define solution and give examples

Answer 2

Solution: the solute and the solvent.
Coffee granules and water.
Milk and hot chocolate powder
Air in a sugar paste=marshmallow

Question 3

What is the solute

Answer 3

Solute: the substance being dissolved.

Question 4

What is a saturated solution

Answer 4

A solution that contains as much dissolved solute as possible at that temperature

Question 5

Explain soluble

Answer 5

If a substance dissolves in the solvent it is soluble

Question 6

Explain insoluble

Answer 6

If a substance does not dissolve in a substance it is know as insoluble

Question 7

What is the solubility of a substance

Answer 7

How much it can dissolve

Question 8

What does solubility depend on

Answer 8

The temperature of the solvent and the volume of the solvent

Question 9

Explain crystallisation

Answer 9

The formation of crystals by cooling a saturated solution

Question 10

Explain a dilute solution

Answer 10

A solution that doesn’t have much solute and a lot of solvent

Question 11

Explain a concentrated solution

Answer 11

A solution that contains a lot of solute and little solvent

Question 12

Explain the experiment to grow crystals with copper sulphate

Answer 12

1. Add water to a beaker until it’s half full and heat on the hot plate.
2. Slowly and with constant stirring, add the copper sulfate to the water.
3. Heat the water to 70°C and add in more copper sulfate until no more will dissolve.
4. Pour approximately half of the solution into a pre-warmed evaporating dish and allow to cool slowly.
5. The remaining solution in the beaker can be quickly cooled by standing it in iced water or by allowing running water from the tap to pour over the outside of the beaker.

Question 13

What is the result and conclusion of the experiment: to grow crystals using copper sulphate

Answer 13

Result
The different cooling methods result in different sized crystals.

Conclusion
Crystallisation occurs when a hot, saturated solution is cooled.

Question 14

How would you conduct a experiment To investigate the solubility of a variety of substances in water

Answer 14

You would

Gather several substances to be dissolved in water. Ex: salt, pepper, sand.
Half fill a beaker with water and add your first substance.
Stir the solution
Repeat this with other substances

If they dissolve they are soluble and if not they are insoluble