Question

When phenolphthalein is added to $NaOH$, the colour of the solution will become __________.

• A. colourless
• B. red
• C. pink
• D. yellow

Answer 1

The correct option is C pink

Since $NaOH$ is a base, it will become dark pink almost purple.

If you add the right amount of $H_{2}S{O}_4$, which is an acid, it will become light pink.

In this case, it is neutral. If you add too much acid, it becomes colorless, meaning its acidic.

Option C is correct.