Question

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

Answer 1

• When baking soda (Sodium hydrogen carbonate) is mixed with lemon juice (citric acid), bubbles form. The bubbles are formed due to the evolution of carbon dioxide gas, which is a chemical change.
• In this change, the citric acid in lemon juice reacts with sodium hydrogen carbonate, resulting in the evolution of carbon dioxide gas.

\[\ce{\underset{(Sodium bicarbonate)}{Baking Soda} + Lemon juice -> \underset{(CO2)}{Carbon dioxide} + Other substances}\]