Question

Ashwini has been given four test-tubes containing the following
(a) Universal indicator
(b) Distilled water
(c) Sodium hydrogencarbonate
(d) Phenolphthalein
​What will be observed by Ashwini when he adds a few drops of acetic acid to each test-tube, one by one?

Answer 1

i) Acetic acid will remain colourless in phenolphthalein.

ii) Acetic acid will dissolve in distilled water forming a clear solution.

iii) Universal indicator gives orange colour with acetic acid.

iv) Sodium hydrogen carbonate will give brisk effervescence due to the formation of CO2 gas.

Answer 2

Answer:

When we add few drops of acetic acid to a test tube containing are as :

a ) . Phenolphthalein : Acetic acid will remain colourless in phenolphthalein

b ) . Distilled water : Acetic acid will dissolve in distilled water forming a clear solution

c ) . Universal indicator : It will give orange colour with acetic acid.

d ) . Sodium hydrogen carbonate : It will give brisk effervescence due to the formation of CO₂ gas.