NCERT Question 4 - Chapter 6 Class 7 - Physical and Chemical Changes

Last updated at April 16, 2024 by

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:

  • When baking soda is mixed with lemon juice, bubbles are formed due to the evolution of carbon dioxide gas . 
  • Since a gas is being evolved , this is a chemical change .

Lemon juice (Acetic acid) + Baking Soda (Sodium Bicarbonate) —> Carbon Dioxide gas + other substances

  • In this change, citric acid contained in lemon juice reacts with sodium hydrogen carbonate which results in the evolution of carbon dioxide gas.
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