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Question

The species present in solution when CO2 is dissolved in water are :
  1. CO2, H2CO3
  2. H2CO3, CO23
  3. CO2,H2CO3, HCO3, CO23
  4. CO23, HCO3

A
H2CO3, CO23
B
CO2,H2CO3, HCO3, CO23
C
CO23, HCO3
D
CO2, H2CO3
Solution
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Carbon dioxide dissolves in water to form carbonic acid.
CO2+H2OH2CO3

Carbonic acid is a weak acid. It dissociates to form carbonate and bicarbonate ions.
H2CO3+H2OHCO3+H3O+

Bicarbonate ion dissociates to form carbonate ion.
HCO3+H2OCO23+H3O+.

Hence, the species present in the solution are CO2,H2CO3,HCO3,CO23.

Option A is correct.

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