18. separation and purification

Question 1

making crystals of copper (II) sulfate

Answer 1

1 add copper(II) oxide to warm sulfuric acid for a faster reaction
2 filter the excess copper(II) oxide from the solution
3 remove most of the water by evaporation
4 cool the solution and allow crystallisation to take place
5 filter the crystals from the solution
5 pat with filter paper to dry them

Question 2

separating solid from liquid

Answer 2

filtering
crystallisation
evaporation

Question 3

simple distillation

Answer 3

used to separate the solvent from a solution leaving the solute behind (read 18.4)

Question 4

fractional distillation

Answer 4

seperate diff liquids from each other (read 18.4)

Question 5

chromatography Rf retention fraction

Answer 5

distance from origin to dot / distance from origin to solvent front