Wet Copper(II) Sulfate is Blue - Dry Copper(II) Sulfate is White

Question 1

What can copper(II) sulfate crystals be used as a test for?

Answer 1

Water

Question 2

What happens when copper(II) sulfate is bound to water?

Answer 2

It forms lovely blue crystals

Question 3

What happens if you heat the blue hydrated copper(II) sulfate crystals?

Answer 3

It drives the water off

Question 4

What does this leave?

Answer 4

A white anhydrous copper(II) sulfate powder, which doesn’t have any water bound to it

Question 5

What happens if you then add a couple drops of water back to the white powder?

Answer 5

You get the blue crystals back again

Question 6

What do you need to do if you want to test for water?

Answer 6

Add anhydrous copper(II) sulfate and sad if the white powder turns blue

Question 7

What won’t the test tell you?

Answer 7

If the water is pure or not

Question 8

What does it mean when a sample is pure?

Answer 8

It’s only made up of one substance

Question 9

This means it has set…

Answer 9

Defined physical properties like boiling point and freezing point