Answer the following questions given below:
Kamali adds a few drops of phenolphthalein to a solution of sodium hydroxide. The solution turns pink. Dilute hydrochloric acid is then added drop by drop while stirring. After some time, the pink colour disappears.
1. What does the disappearance of the pink colour indicate?
2. Write the balanced chemical equation for the reaction.
3. Identify the type of reaction taking place.