You Can Use Filtration and Crystallisation to Separate Rock Salt

Question 1

What is rock salt a mixture of?

Answer 1

Salt and sand

Question 2

What are both salt and sand?

Answer 2

Compounds

Question 3

How are salt and sand different?

Answer 3

Salt dissolved in water, sand doesn’t

Question 4

What do you do to the rock salt first?

Answer 4

Grind it up with a pestle and mortar

Question 5

What do you do to it second?

Answer 5

Dissolve it in a beaker and stir

Question 6

What do you do to it third?

Answer 6

Filter through filter paper in a funnel

Question 7

What do you do fourth?

Answer 7

Crystallisation - evaporate in an evaporating dish

Question 8

What happens to the sand?

Answer 8

It doesn’t dissolve

It won’t fit through the holes in the filter paper so instead collects on it

Question 9

What happens to the salt?

Answer 9

It dissolves in the solution, so goes through

When waters evaporated, salt forms as crystals in the evaporating dish

Question 10

What are the 4 steps of this method in order?

Answer 10

Grinding
Dissolving
Filtering
Crystallisation