Filtration and crystallization

Question 1

What is filtration?

Answer 1

A method used to separate an insoluble solid from a liquid by passing the mixture through filter paper, which traps the solid and lets the liquid through.

Question 2

What does the filter paper do in filtration?

Answer 2

It allows the liquid (filtrate) to pass through while the solid (residue) remains trapped.

Question 3

What type of mixture is suitable for filtration?

Answer 3

A mixture of an insoluble solid and a liquid.

Question 4

What is crystallisation?

Answer 4

A method used to separate a dissolved solid (solute) from a solution by evaporating the solvent, allowing crystals of the solute to form.

Question 5

Why does crystallisation require a relatively low boiling point?

Answer 5

To allow the solvent to evaporate without decomposing or damaging the solute.

Question 6

When is crystallisation without heat used?

Answer 6

When the solute or solvent is heat sensitive, or when you want to form layered, well-formed crystals.

Question 7

How is crystallisation done without heat?

Answer 7

The solvent is left to evaporate slowly at room temperature, which helps form better-quality crystals.