SAQ : Aqueous solution of CO2 is acidic or basic or neutral? How would you show that?

Question

Aqueous solution of CO₂ is acidic or basic or neutral? How would you show that?

Answer

Aqueous solution of CO₂ is weakly acidic. This can be shown by adding an indicator such as bromothymol blue, which will turn yellow in an acidic solution, to the CO₂ solution and observing the colour change.