Chemical Analysis: Anions

Question 1

How do you detect sulfate ions?

Answer 1

Add a few drops of dilute hidyrochloric acid.
Then add a few drops of barium chloride solution , BaCl2(aq)

Question 2

What is the equation for Sulfate Ions test?

Answer 2

Ba2+ (aq) + SO42- (aq) => BaSO4 (s)

Question 3

What is the result of a sulfate ions test?

Answer 3

If sulfate ions are present, you get a white precipitate.

Question 4

How do you detect carbonate ions?

Answer 4

Add a few drops of hydrochloric acid.

Question 5

What is the equation for Carbonate ions test?

Answer 5

2H+ + CO32- → CO2 + H20

Question 6

What is the result of a carbonate test?

Answer 6

If carbonate ions are present, bubbles will be produced. You can confirm that the gas is CO2 by bubbling it through limewater.

Question 7

How do you detect Halide Ions?

Answer 7

Add a few drops of dilute nitric acid.
Then add a few drops of silver nitrate solution.

Question 8

If Chloride is present, what colour will the silver halide precipitate be?

Answer 8

White

Question 9

If Bromide is present, what colour will the silver halide precipitate be?

Answer 9

Cream

Question 10

If Iodide is present, what colour will the silver halide precipitate be?

Answer 10

Yellow