(i) HCO3- + HS- <-> H2CO3 + S2-
Which is the stronger acid? bicarbonate or hydrogen sulphite?
since carbonate anion is a stronger base than the sulphite anion, then HS
- must be a stronger acid than HCO
3-, therefore the bicarbonate anion will be protonated.
Try to follow this line of reasoning for the 2nd reaction..