Chemical Analysis Paper 2 (Tests)

Question 1

Test and result for chlorine gas

(gas test)

Answer 1

Test: Damp blue litmus paper
Result: Bleaches it white

Question 2

Test and result for carbon dioxide gas

(gas test)

Answer 2

Test: Bubble through limewater
Result: Turns it cloudy

Question 3

Test and result for oxygen gas

(gas test)

Answer 3

Test: Glowing splint
Result: Relights it

Question 4

Test and result for hydrogen gas

(gas test)

Answer 4

Test: Lit splint
Result: Squeaky pop

Question 5

Test and result for carbonate ions

(anion test)

Answer 5

Test: React with an acid, bubble gas through limewater
Result: Turns it cloudy

Question 6

Test and result for sulfate ions

(anion test)

Answer 6

Test: Remove impurities with hydrochloric acid, add barium chloride
Result: Forms a white precipitate

Question 7

Test for halide ions

(anion test)

Answer 7

Test: Remove impurities with nitric acid, add silver nitrate

Question 8

Result for chloride ions

(halide test)

Answer 8

Result: White precipitate

Question 9

Result for bromide ions

(halide test)

Answer 9

Result: Cream precipitate

Question 10

Result for iodide ions

(halide test)

Answer 10

Result: Yellow precipitate

Question 11

2 tests for metal ions

(cation test)

Answer 11

1. Test: Flame test
2. Test: Sodium hydroxide test

Question 12

Result for lithium ions

(flame test)

Answer 12

Result: Crimson flame

Question 13

Result for calcium ions

(flame test)

Answer 13

Result: Orange/red flame

Question 14

Result for potassium ions

(flame test)

Answer 14

Result: Lilac flame

Question 15

Result for copper(II) ions

(flame test)

Answer 15

Result: Green flame

Question 16

Result for sodium ions

(flame test)

Answer 16

Result: Yellow flame

Question 17

Result for magnesium ions

(sodium hydroxide test)

Answer 17

Result: White precipitate

Question 18

Result for calcium ions

(sodium hydroxide test)

Answer 18

Result: White precipitate

Question 19

Result for aluminium ions

(sodium hydroxide test)

Answer 19

Result: White precipitate, if sodium hydroxide added in excess then colourless solution

Question 20

Result for iron(II) ions

(sodium hydroxide test)

Answer 20

Result: Green precipitate

Question 21

Result for iron(III) ions

(sodium hydroxide test)

Answer 21

Result: Brown precipitate

Question 22

Result for copper(II) ions

(sodium hydroxide test)

Answer 22

Result: Blue precipitate