Question

A student added a few drops of phenolphthalein to an aqueous solution of sodium
carbonate. State the change in colour.
What would happen if he puts this coloured solution on a white cloth.
Will the colour on the cloth persist ? Why or why not ?

Answer 1

when a few drops of phenolphthalein is added to an aqua solution of sodium carbonate then the colour will change to pink.

Explanation:

• Sodium carbonate is formed by  a strong base and a weak acid

• as a result of this it is basic in nature. When dissolved in water it is alkaline in nature and as a result of the phenolphthalein which acts as an indicator will change its colour to pink. In acidic medium phenolphthalein changes its colour to colourless.

• When put this solution on a white cloth the colour will not be present because of the change in the pH.

To know more about phenolphthalein

When few drops of phenolphthalein are added to a dilute solution of ...

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Answer 2

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Colour changes to pink