Anion Tests

Question 1

How to test for an ammonium ion?

Answer 1

5 cm3 of sodium hydroxide solution

Question 2

What smell will be present when ammonium ion is present with ammonia gas?

Answer 2

A pungent smell

Question 3

How to test for sulfate ions?

Answer 3

Dissolve a spatula measure of test compound in nitric acid or HCl, then add 2 to 3 cm3 of barium chloride

Question 4

What will form if barium sulfate is present?

Answer 4

A white precipitate

Question 5

The equation for sulfate ions with barium chloride?

Answer 5

Ba^2+ (aq) + SO4^2- (aq) ~> BaSO4 (s)

Question 6

How to test for carbonate ions?

Answer 6

Place 5 cm3 of dilute nitric acid then add a spatula of the test compound

Question 7

Positive test for carbonate ions?

Answer 7

A gas will be produced (effervescence) and the solid will disappear.

Question 8

Test for iodine?

Answer 8

Add few drops of starch to the test salutation

Question 9

What colour will starch turn if iodine is present?

Answer 9

Blue-black