Chemical Analysis

Question 1

What coloured precipitate do you get from reacting Aluminium, Calcium or Magnesium with sodium hydroxide

Answer 1

• White Precipitate

Question 2

What coloured precipitate do you get from reacting Copper (II) with sodium hydroxide

Answer 2

• Blue Precipitate

Question 3

What coloured precipitate do you get from reacting Iron (II) with sodium hydroxide

Answer 3

• Green Precipitate

Question 4

What coloured precipitate do you get from reacting Iron (III) with sodium hydroxide

Answer 4

• Brown Precipitate

Question 5

Test for Carbonate negative ions and positive result

Answer 5

• Add dilute Hydrochloric acid
• Fizzing as CO2 gas is produced

Question 6

Test for Sulphate negative ions and positive result

Answer 6

• Add dilute Hydrochloric acid, followed by barium chloride solution
• White precipitate barium sulphate

Question 7

Test for Halide negative ions and positive result

Answer 7

• Add dilute nitric acid, the nigger nitrate
• Chloride - white precipitate
• Bromide - cream precipitate
• Iodide - light yellow precipitate