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Universal Indicator

What Is Unive...

Question

What is a Universal indicator?

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Solution

Universal indicator:
A universal indicator is a mixture of different types of indicators that exhibits different coloration at different $pH$ levels.
It is used to detect the acidic or basic nature of a substance or a solution.
It can be in the form of a paper strip or a solution.
Example: Methyl red, and Phenolphthalein.

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Q. (a) Define an indicator.
(b) Explain, why a universal indicator is preferred to acid-base indicators.

Q. (a) What is a universal indicator? For what purpose is it used?
(b) How does a universal indicator work?
(c) Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?

Q. (a) What would you expect the pH of pure water to be?
(b) What colour would the universal indicator show in an aqueous solution of sugar? Why?
(c) A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?

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