Flame & Ion Testing

Question 1

What colour is lithium flame test

Answer 1

Crimson

Question 2

What colour is copper flame test

Answer 2

Green

Question 3

What colour is sodium flame test

Answer 3

Yellow

Question 4

What colour is calcium flame test

Answer 4

Orange/ red

Question 5

What flame colour is potassium

Answer 5

Lilac

Question 6

Why may a colour of a flame test be difficult to distinguish

Answer 6

Low concentration of the metal compound

Sample may contain a mixture of the metal ions

Question 7

What colour precipitate is produced when sodium hydroxide is added to copper (II) ions

Answer 7

Blue

Question 8

What colour precipitate is produced when sodium hydroxide is added to iron (II) ions

Answer 8

Green

Question 9

What colour precipitate is produced when sodium hydroxide is added to iron (III) ions

Answer 9

Brown

Question 10

How do you test for a carbonate ion/ CO2?

Answer 10

Mix solution with acid, if bubbles, put into lime water that will turn cloudy if CO2 is present

Question 11

How to test for halide ions?

(Chloride, bromide, iodide)

Answer 11

1. Add dilute nitric acid to sample
2. Add dilute silver nitrate solution
3. It will make a coloured precipitate

Question 12

What colour precipitate does the halide chloride produce?

Answer 12

White

Question 13

What colour precipitate does the halide bromide produce?

Answer 13

Cream

Question 14

What colour precipitate does the halide iodide produce?

Answer 14

Yellow