You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution

cbse
acids-bases-salts
cbse-class-7-science

#1

You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution. Write down an activity to find the nature (acidic/basic/neutral) of each solution.

Answer:
Litmus paper as indicator

  • With the help of a dropper, put a drop of sugar solution on a strip of the blue litmus paper.
  • What do you observe? Write down if there is any change in colour.
  • Repeat the above activity with the red litmus paper.
    You will observe that blue litmus turns red, but there is no effect on red litmus paper. Thus, sugar solution is acidic in nature.
  • Now, repeat the above activity with the following substances:
  1. Salt solution
  2. Baking soda solution
  3. Tamarind solution

If blue litmus paper turns red while the red litmus paper remains unchanged, the solution is said to be acidic. If red litmus paper turns blue while the blue litmus paper remains unchanged, the solution is alkaline. If both the red and blue litmus papers remain unchanged, the solution is neutral.