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Phenolphthalein

Write names o...

Question

Write names of any three acid-base indicators. What are the changes in color observed when these indicators are added in acidic medium?

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Solution

Indicator Change in acidic medium

1. Blue litmus paper Blue to Red

2. Methyl orange Orange to pink

3. Phenolphthalein Remains colourless

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Write any three indicators and how they change in acidic medium? [3 MARKS]

Q. Mention the colour changes observed when the following indicators are added to acids:
(a) Alkaline phenolphthalein solution.
(b) Methyl orange solution.
(c) Neutral litmus solution.

(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.

(b) Name an acid-base indicator extracted from lichen.

(c) What colour does the methyl orange turn to when put in an acidic solution ?

Q. Consider the following statements :

(A) Both acids and bases change the colour of all indicators.
(B) If an indicator gives a colour change with an acid, it does not give a change with a base.
(C) If an indicator changes colour with a base, it does not change colour with an acid.
(D) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?

Q. (a) What is an indicator? Name three common indicators.
(b) Name the acid-base indicator extracted from lichen.
(c) What colour does the turmeric paper turn when put in an alkaline solution?

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