Test for Cations & Flame Tests

Question 1

Lithium flame test (Cation)

Answer 1

Red flame

Question 2

Sodium flame test (Cation)

Answer 2

Yellow flame

Question 3

Potassium flame test (Cation)

Answer 3

Lilac flame

Question 4

Calcium flame test (Cation)

Answer 4

Orange-red flame

Question 5

Copper flame test (Cation)

Answer 5

Green flame

Question 6

How do you carry out a flame test?

Answer 6

A clean platinum wire loop dipped in HCl and held under a flame. No colour = start the test. Repeat step 1 until flame has no colour.

Question 7

When sodium hydroxide is added to Copper (II) what colour is achieved in the precipitate? (Cation)

Answer 7

Blue precipitate

Question 8

When sodium hydroxide is added to Iron (II) what colour is achieved in the precipitate? (Cation)

Answer 8

Sludgy Green

Question 9

When sodium hydroxide is added to Iron (III) what colour is achieved in the precipitate? (Cation)

Answer 9

Reddish Brown

Question 10

Test for Carbonates (Anion)

Answer 10

Add HCl. If carbonates are present then CO2 is released.

Question 11

Test for Sulphate (Anion)

Answer 11

Add HCl, followed by Barium Chloride solution. A white precipitate is formed then the compound was a sulfate.

Question 12

Test for Halides (Anion) how to do it.

Answer 12

Add dilute nitric acid, followed by silver nitrate solution.

Question 13

Silver nitrate test - Chlorine

Answer 13

White precipitate

Question 14

Silver nitrate test - Bromine

Answer 14

Cream precipitate

Question 15

Silver nitrite test - Iodine

Answer 15

Yellow precipitate