Question

A test tube contains solution of NaOH and phenolphthalein. Why the colour of the solution changes when HCL in added to it

Answer 1

when the test tube contains sodium hydroxide and phenolphthalein then its colour would be pink and when HCL is added in it it will convert itself into colourless because noun the solution which was initially basic in nature becomes acidic in nature by adding HCL in it

Answer 2

Explanation:

when the testube contain sodium hydroxide and phenolphthalein then it's colour would be pink and when HCL is added in it will convert itself into colurless because noun the solution which was initially basic in nature