Question

5. State which separation method you would use to carry out the following separations: a) Water from potassium iodide solution. b) Potassium iodide from potassium iodide solution. c) Calcium carbonate (insoluble in water) from a mixture of calcium carbonate and water. d) Separate a mixture of water, ethanol and vinegar. e) Blue dye from a mixture of red and blue dyes. f) Separating crude oil into diesel, petrol etc.

Answer 1

a)filtration

b)

c)as it fill form precipitate so filtration

d)funnel

e)chromatography

f)distillation

Answer 2

We will use the following separation methods:

a) Distillation

• It is based on the principle of difference in boiling points of the two components.
• Boiling point of water is much lower than that of KI.

b) Distillation (same as above since potassium iodide solution = water + KI)

• It is based on the principle of difference in boiling points of the two components.
• Boiling point of water is much lower than that of KI.

c) Filtration

• Since the two components of solution (CaCO3 and water) are insoluble with each other, they can be separated using filtration.

d) Frictional Distillation

• When the components to be separated have a little difference in their boiling points, fractional distillation is used.

e) Liquid chromatography

• Liquid chromatography separates molecules in a liquid mobile phase using a solid stationary phase

f) Fractional distillation

• The solution is boiled in fractional distillation apparatus and the one with lowest boiling point separates out first.