Cation

Question 1

Flame test - Lilac

Answer 1

Potassium

Question 2

Flame test - Green

Answer 2

Copper (II)

Question 3

Flame test - Yellow-orange

Answer 3

Sodium

Question 4

Flame test - brick red

Answer 4

Calcium

Question 5

Test for potassium cation

Answer 5

Flame test

Lilac flame

Question 6

Test for copper (II) cation

Answer 6

Flame test
Green flame

Sodium hydroxide
Blue precipitate

Question 7

Test for sodium cation

Answer 7

Flame test

Yellow-orange flame

Question 8

Test for calcium cation

Answer 8

Flame test

Brick red flame

Question 9

Describe sodium hydroxide test

Answer 9

Add sodium hydroxide solution to compound solution
Record precipitate colour for metal cation
Test for ammonia gas

Question 10

Sodium hydroxide - Green precipitate

Answer 10

Iron (II)

Question 11

Sodium hydroxide - Red-brown precipitate

Answer 11

Iron (III)

Question 12

Sodium hydroxide - blue precipitate

Answer 12

Copper (II)

Question 13

Sodium hydroxide - pungent gas

Answer 13

Turn red litmus paper blue

Ammonium

Question 14

Test for iron (II) cation

Answer 14

Add sodium hydroxide solution

Green precipitate

Question 15

Test for iron (III) cation

Answer 15

Add sodium hydroxide solution

Red-brown precipitate

Question 16

Test for ammonium cation

Answer 16

Add sodium hydroxide solution

Produce ammonia gas

Question 17

Describe flame test

Answer 17

Add compound/compound solution to splint
Place splint in blue roaring flame
Record colour for cation