Question

can phenolphthalein be used as an indicator to distinguish between acid and alkali

Answer 1

Explanation:

Yes.Alkalis are nothing but bases which are soluble in water.Phenolphthalein turns colourless on reacting with acids and turns pink on reacting with bases or alkalis.

Answer 2

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Answer:

Yes

Explanation:

Aim:

To prove phenolphthalein can be used an an indicator to distinguish between acid and alkali

Materials Needed:

*Vinegar

*Baking Soda

*Phenolphthalein

*Test Tube

Method:

Step 1: Take small quantities of caustic soda solution and vinegar in two separate test tubes

Step 2: Add 2 drops of Phenolphthalein  to each test tube

Observation:

Phenolphthalein is colorless in acidic solutions like vinegar

Phenolphthalein would change colour from colourless to pink because baking soda has a ph of 9.