Positive and Negative Ions

Question 1

Test for Lithium

Answer 1

Crimson flame

Question 2

Test for Sodium

Answer 2

Orange/Yellow flame

Question 3

Test for Potassium

Answer 3

Lilac flame

Question 4

Test for Calcium

Answer 4

Brick Red flame
White precipitate when reacted with Sodium Hydroxide

Question 5

Test for Copper (II)

Answer 5

Green flame
Blue precipitate when reacted with Sodium Hydroxide

Question 6

Test for Aluminium

Answer 6

White precipitate when reacted with Sodium Hydroxide- re-dissolves in excess

Question 7

Test for Magnesium

Answer 7

White precipitate when reacted with Sodium Hydroxide

Question 8

Test for Iron (II)

Answer 8

Green precipitate when reacted with Sodium Hydroxide

Question 9

Test for Iron (III)

Answer 9

Red/Brown precipitate when reacted with Sodium Hydroxide

Question 10

Test for Carbonate

Answer 10

Fizzes in acid
Limewater turns cloudy

Question 11

Equation for Carbonate

Answer 11

CO3,2- + 2H+ —> CO2 + H2O

Question 12

Test for Chloride

Answer 12

White precipitate when reacted with nitric acid and silver nitrate

Question 13

Test for Bromide

Answer 13

Cream precipitate when reacted with nitric acid and silver nitrate

Question 14

Test for Iodide

Answer 14

Yellow precipitate when reacted with nitric acid and silver nitrate

Question 15

General equation for Halide test

Answer 15

Ag+(aq) + X-(aq) —> AgX(s)

Question 16

Test for Sulfates

Answer 16

White precipitate when reacted with Hydrochloric acid and Barium chloride

Question 17

Equation for Sulfates test

Answer 17

Ba2+(aq) + SO42-(aq) —> BaSO4(s)