Question

A student took a half-filled test tube with dilute hydrochloric acid and a few drops of phenolphthalein in the solution. As he put a few drops of sodium hydroxide into the solution, it turns to light pink. Further, he put a few extra drops of the acid and observes that the colour disappears. What caused the colour to disappear from the solution?​

Answer 1

Answer:

THIS HAPPENS BECAUSE INITIALLY THE NaOH NEUTRALIZES THE HCl BUT WHEN EXCESS OF IT IN PUT IN THE TEST TUBE, THE SOLUTION BECOMES BASIC AND THE LIGHT PINK COLOUR PRODUCED IS NEUTRALIZED AND IT DISAPPEARS

Explanation: mark brainliest pls