Question

Sodium hydroxide is taken in a test tube and a few drops of phenolphthalein is added to it ,then dilute hydrochloric acid is added drop by drop . What will you observe?why? What will happen if excess hydrochloric acid is added to this solution?

Answer 1

NaOH+ phenolphthalein gives us pink colour

NaOH+ phenolphthalein+ HCI gives colourless solution

Answer 2

Answer:

When phenolphthalein is added to sodium hydroxide solution pink colour appears. When  hydrochloric acid is added to it, the pink colour disappears because neutralisation reaction takes  place. Sodium hydroxide is neutralised by hydrochloric acid. If we keep on adding hydrochloric  acid even after decolourisation of solution, it will remain colourless because acids do not  change the colour of phenolphthalein.

Explanation:

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