Tests for Positive Ions

Question 1

What is the test for a Lithium ion
Li+

Answer 1

Flame test: Red

Question 2

What is the test for a sodium ion?
Na+

Answer 2

Flame test: yellow

Question 3

What is the test for a potassium ion
K+?

Answer 3

Flame test: lilac

Question 4

What is the test for a calcium ion
Ca+?

Answer 4

Flame test: orange/red/brick red

Question 5

What is the test for a copper ion
Cu+?

Answer 5

Flame test: blue/green/turquoise

Question 6

What is the test for aluminium ions
Al+?

Answer 6

Precipitate test: white, excess NaOH goes colourless

Question 7

What is the test for a calcium ion
Ca+ (precipitate)

Answer 7

Precipitate test goes white, excess NaOH stays same

Question 8

What is the test for a Copper ion
Cu+ (precipitate)

Answer 8

Precipitate test, goes blue

Question 9

What is the test for an Iron (II) ion
Fe2+?

Answer 9

Precipitate test, goes green

Question 10

What is the test for an Iron (III) ion
Fe3+?

Answer 10

Precipitate test, goes brown

Question 11

To test for ammonia ions, you should:

Answer 11

1. Add dilute sodium hydroxide solution to the sample
2. Warm the mixture

Question 12

What is the test for ammonia gas?

Answer 12

Ammonia turns damp red litmus paper blue