Tests for Metal Ions <3

Colour in flame test for lithium compounds…

Crimson

Colour in flame test for sodium compounds…

Yellow

Colour in flame test for potassium compounds…

Lilac

Colour in flame test for calcium compounds…

Orange-red

Colour in flame test for copper compounds…

Green

What compound can also be used to identify cations?

Sodium hydroxide

What happens when sodium hydroxide is added to aluminium ion solution?

Initially, a white precipitate forms. In excess, the precipitate dissolves- a colourless solution is formed.

What happens when sodium hydroxide is added to calcium ion solution?

A white precipitate is formed.

What happens when sodium hydroxide is added to magnesium ion solution?

A white precipitate is formed.

What happens when sodium hydroxide is added to copper(II) ion solution?

A blue precipitate is formed.

What happens when sodium hydroxide is added to iron(II) ion solution?

A green precipitate is formed.

What happens when sodium hydroxide is added to iron(III) ion solution?

A brown precipitate is formed.