Tests For Ions

Question 1

Test for lithium,sodium and potassium ions

Answer 1

Flame test
* Lithium=bright red
* Sodium=yellow
* Potassium=lilac

Question 2

Test for calcium,barium and copper ions

Answer 2

Flame test
* Calcium=brick red
* Barium=apple green
* Copper=blue green

Question 3

Test for sulfate ions

Answer 3

Add barium chloride it should produce barium sulfate which a white precipitate

Question 4

Test for halide ions

Answer 4

Add silver nitrate which should result in the following percipiates
* White=chloride
* Cream=bromide
* Yellow=iodide

Question 5

Test for carbonate ions

Answer 5

Add nitric acid and the gas produced turns limewater cloudy

Question 6

Test for nitrate ions

Answer 6

Add sodium hydroxide then davarda’s alloy and gently heat
The nitrate ions are reduced by aluminium to produce ammonia gas. This turns damp red litmus paper blue

Question 7

Test for ammonium ions

Answer 7

Add sodium hydroxide and gently heat. Reaction produces ammonia gas which turns damp red litmus paper blue

Question 8

Test for copper(II), iron(II) and iron(III)

Answer 8

Add sodium hydroxide and a percipitate is seen
* Copper=blue percipitate
* Iron(II)=green percipitate
* Iron(III)=orange/brown percipitate

Question 9

Test for calcium, magneisum and aluminium

Answer 9

Add sodium hydroxide and a percipiate can be seen
* Calcium=white percipiate
* Magnesium=white percipiate
* Aluminium=white percipiate which dissolves in excess sodium hydroxide

Question 10

Test for lead ions

Answer 10

Add potassium iodide and a bright yellow percipitate is formed