8.3 - Qualitative analysis

Question 1

What is the test for carbonates?

Answer 1

• Bubble gas through limewater, saturated calcium hydroxide solution
• White precipitate of calcium carbonate (cloudy)

Question 2

What is the test for sulfates?

Answer 2

• Aqueous barium ions are added to the unknown compound solution
• Dense white precipitate forms

Question 3

Results of chloride in a silver precipitate

Answer 3

White colour
Soluble - dilute ammonia
Soluble - concentrated ammonia

Question 4

Results of bromine in a silver precipitate

Answer 4

Cream colour
Insoluble - dilute ammonia
Soluble - concentrated ammonia

Question 5

Results of iodine in a silver precipitate

Answer 5

Yellow colour
Insoluble - dilute ammonia
Insoluble - concentrated ammonia

Question 6

What is the correct sequence of tests?

Answer 6

1. Carbonate
2. Sulfate
3. Halide

Question 7

What is the test for ammonium ion?

Answer 7

• Test gas released through warming of the ammonia with moist pH indicator paper, it will turn blue