Tests for Anions And Cations

Question 1

Halide ions

Answer 1

i) Nitric acid
ii) Silver nitrate

Cl- - white ppt
Br- - cream ppt
I- - yellow ppt

Question 2

Sulfate ions

Answer 2

i) Barium chloride
ii) Dil. HCl

White ppt

Question 3

Carbonate ions

Answer 3

i) HCl

Gas/effervescence
Cloudy lime water due to CO2

Question 4

Hydroxide ions

Answer 4

i) Ammonium chloride

Ammonia smell

Question 5

Ammonium ions

Answer 5

i) Sodium hydroxide

Ammonia smell

Question 6

Ammonia gas

Answer 6

Red litmus turns blue

Question 7

Group 2 ions: Ba 2+

Answer 7

1) NaOH -> colourless solution
2) H2SO4 -> white ppt

Question 8

Group 2 ions: Ca 2+

Answer 8

1) NaOH -> slight white ppt
2) H2SO4 -> slight white ppt

Question 9

Group 2 ions: Mg 2+

Answer 9

1) Dil. NaOH -> slight white ppt
2) Conc. NaOH -> white ppt
3) Dil. H2SO4 -> slight white ppt
4)Conc. H2SO4 -> colourless solution

Question 10

Group 2 ions: St 2+

Answer 10

1) NaOH -> slight white ppt
2) H2SO4 -> white ppt