Question

Pink colour of phenolphthalein in alkaline medium is due to

Answer 1

The phenolphthalein molecule is colourless, and the phenolphthalein ion is pink.When a alkaline (base) is added to the phenolphthalein, the molecule ⇌ ions equilibrium shifts to the right, leading to more ionization as H+ ions are removed. So it makes the solution pink.

Answer 2

Answer:

here's the answer:-

It is a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless, and the phenolphthalein ion is pink. When a base is added to the phenolphthalein,the molecule-ions in equilibrium shifts to the right, leading to more ionization as H+ ions are removed.

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