Cation Tests- Sodium Hydroxide

Question 1

Copper(II) add sodium hydroxide

Answer 1

Light blue precipitate (copper hydroxide)

Question 2

Iron(II) add sodium hydroxide

Answer 2

Green precipitate (iron 2 hydroxide)

Question 3

Iron(III) add sodium hydroxide

Answer 3

Red-brown precipitate (iron 3 hydroxide)

Question 4

Aluminium add sodium hydroxide

Answer 4

White precipitate (aluminium hydroxide)

Question 5

Ammonium (test)

Answer 5

Add sodium hydroxide, warm and test with damp red litmus paper

Question 6

Ammonium (results)

Answer 6

Damp red litmus paper turns blue (ammonia gas produced)