Question

what do you observe wken few drops of sodium hydroxide solution is added to three test tubes containing red litmus, distill water and phenolphthalein

Answer 1

Red litmus : It changes to blue.
Distilled.water : No change
Phenolpthalein : Changes to dark pink

Answer 2

Acetic acid is a weak acid, so when added with different substances it will give varies different results.

Below are the results of all the changes which the acid will undergo on treating it with different types of substances. A) phenolpthalein will be transform into dismal because of acidic medium  

b) general marker will be transform into yellowish pink and pH is close to 6  

c) refined water will give genuine arrangement  

d) sodiumbicarbonate will deliver carbon dioxide