Tests

Question 1

Test for carbonate

Answer 1

With dilute hydrochloric acid, carbonates fizz as they release carbon dioxide. Can test for carbon dioxide with limewater

Question 2

Test for sulfate

Answer 2

Add dilute HCl (get rid of carbonates that would also give positive test) and add barium chloride, barium sulfate white precipitate forms.

Question 3

Test for ammonium compounds

Answer 3

Add sodium hydroxide and gently heat, ammonia given off (turns damp red litmus paper blue)

Question 4

Lithium flame test colour

Answer 4

Red

Question 5

Sodium flame test colour

Answer 5

orange/yellow

Question 6

Rubidium flame test colour

Answer 6

Red

Question 7

Caesium flame test colour

Answer 7

Blue

Question 8

Calcium flame test colour

Answer 8

Brick red

Question 9

Strontium flame test colour

Answer 9

Crimson

Question 10

Barium flame test colour

Answer 10

Green

Question 11

How to flame test

Answer 11

Mix compound with HCl few drops.
Heat nichrome to clean in bunsen
Dip wire into mixture and hold in hot flame

Question 12

Acidic gas test

Answer 12

Turns damp blue litmus paper red