Question

Observe the figure and answer the following questions:

1. Which gas is released out as effervescence in the big test tube?
2. What is the colour change in the lime water?
3. Write the related chemical equation.

Answer 1

1. The gas released with effervescence in the big test tube is carbon dioxide (CO₂).
2. The lime water turns milky (white) due to the formation of calcium carbonate.
3. The related chemical equation is:
   \[\ce{\underset{Acetic acid}{2CH3COOH} + \underset{Sodium carbonate}{Na2CO3} -> \underset{Sodium acetate}{2CH3COONa} + \underset{Water}{H2O} + \underset{Carbon dioxide}{CO2}}\]