Methods of Purification

Question 1

filtration

Answer 1

insoluble solid from a liquid

Question 2

filtration method

Answer 2

the insoluble solid (residue) will remain in the filter paper, while the filtrate is filtered through the filter paper and drips down the funnel into the beaker

Question 3

crystallisation

Answer 3

soluble solid from a solution

Question 4

crystallisation method

Answer 4

1) pour the solution into the evaporating dish
2) slowl heat the solution, some of the solvent will evaporate and the solution will get more concentrated. stop heating when crystals start to form
3) remove the dish from the heat and the rest of the solvent will slowly evaporate
4) dry the product by using a drying oven or a desicator

Question 5

seperating rock salt

Answer 5

water is added to dissolve salt buz leave other solids undissolved

filter off the insoluble impurities

heat the salt solution and leave it to crystallise and form salt crystals

Question 6

simple disstilation

Answer 6

1) the solution is heated. the solvent boils and evaporates
2) the vapour then evaporates and condenses in the condenser

3 it is then collected in the beaker

Question 7

fractional distillation

Answer 7

• liquid with lower boiling point will evaporate first and rise up the fra. column
• once the other liquid is evaporating the reading on the thermometer will change