Question

What do you observe when you drop a few drops of acetic acid to a test tube containing a)phenolphthalein b)universal indicator c)distilled water d)sodium hydrogen carbonate?

Answer 1

Hi !

(i) Acid remains colourless , when  added to phnolphthalein .

(ii) Acetic Acid turns universal indicator to pale orange.

(iii) Acetic acid  forms a clear solution ( or gets dissolved in water )

(iv) Acid + Metal hydrogen carbonate  ----> Salt + CO₂ + H₂O

Hence, when acetic acid reacts with sodium hydrogen carbonate , a gas with brisk effervescence is formed ( CO₂) 

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.