CHEMICAL ANALYSIS - TESTING FOR NEGATIVE IONS [C12.5]

Question 1

carbonates test?
(process)

Answer 1

1. add a dilute acid (eg hydrochloric acid)
2. if it fizzes = positive for carbonates
3. TO BE CERTAIN : put into limewater, if it turns milky white, then it is positive for carbonates

Question 2

what do you test for with BARIUM CHLORIDE?

Answer 2

SULPHATES

Question 3

sulphates test?
(process)

Answer 3

1. add dilute hydrochloric acid (to removes carbonate ions)
2. add barium chloride
3. if a white precipitate is formed, then is it positive for sulphate

Question 4

what do you test for with SILVER NITRATE?

Answer 4

HALIDES (halogen + metal compound)

Question 5

halides test?
(process)

Answer 5

1. add dilute nitric acid (to remove carbonate ions)
2. add silver nitrate
3. if precipitate is formed, the test is positive for Halides

Question 6

halides precipitate colours; CHLORINE

Answer 6

WHITE

Question 7

halides precipitate colours; BROMINE

Answer 7

CREAM

Question 8

halides precipitate colours; IODINE

Answer 8

YELLOW