Separate Chemistry 2

Question 1

What colour do lithium ions turn in flame tests?

Answer 1

Red

Question 2

What colour do sodium ions turn in flame tests?

Answer 2

Yellow

Question 3

What colour do potassium ions turn in flame tests?

Answer 3

Lilac

Question 4

What colour do calcium ions turn in flame tests?

Answer 4

Brick red (Orange/Red)

Question 5

What colour do copper ions turn in flame tests?

Answer 5

Blue/Green

Question 6

What is the precipitate colour of aluminium ions in NaOH precipitate tests?

Answer 6

White, excess NaOH goes colourless

Question 7

What is the precipitate colour of calcium ions in NaOH precipitate tests?

Answer 7

White, excess NaOH stays same

Question 8

What is the precipitate colour of copper ions in NaOH precipitate tests?

Answer 8

Blue

Question 9

What is the precipitate colour of Iron(II) ions in NaOH precipitate tests?

Answer 9

Green

Question 10

What is the precipitate colour of
Iron(III) ions in NaOH precipitate tests?

Answer 10

Brown

Question 11

How do you test for carbonate ions?

Answer 11

• Detected by using a dilute acid
• Bubbles are given off
• Test with limewater, if cloudy it’s CO2

Question 12

How do you test for sulfate ions?

Answer 12

• Add couple drops hydrochloric acid
• Add couple drops Barium chloride
• A white precipitate will form

Question 13

How do you test for halide ions?

Answer 13

• Add few drops dilute nitric acid
• Add few drops dilute silver nitrate solution
• Record colour of precipitate

Chloride - White
Bromide - Cream
Iodide - Yellow

Question 14

How do you test for ammonia?

Answer 14

• React with hydroxide solution
• Warm the mixture
• Ammonia gas is given off
• Turns damp red litmus paper blue

Question 15

How do you test for chlorine?

Answer 15

Damp blue litmus turns white