Anion Tests

Question 1

Group A (I)
(with dil.H2SO4)

Answer 1

CO2 (CO₃ ^2- , HCO₃^-)
SO2(SO₃ ^-2, HSO₃^- , S₂O₃ ^-2)
S-2
NO2-
CH3COO-

Question 2

Group A (II)
(with conc. H2SO4)

Answer 2

Cl- , Br- , I-, NO3- , C₂O₄^-2 , F- , BO₃^-3

Question 3

Group B (I)
(By ppt)

Answer 3

SO4^-2 , PO4^-3 , AsO4 ^-3 , Si2O3 ^-2 CrO4^-2

Question 4

Group B (II)
(By redox)

Answer 4

Cr₂O₇^-2 , MnO₄^- , MnO₄^-2

Question 5

Sodium Extract

Answer 5

1 part salt + 3 part Na2O3 + water

used
Salt partiallyfully insoluble
Cation ineterfere
Colour too intense

Question 6

Interfering anions

Answer 6

F- , C₂O₄^-2 , BO₃^-3 , Si2O3 ^-2

Question 7

Solubility of Carbonates

Answer 7

All cabonates except NH4+ and alkali metals are insoluble