4. What are universal indicators and what are their uses?
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Universal indicator is a substance which tells you by means of a colour change whether a substance is an acid or a base. It is used by scientists in laboratories all the time, as they need to know which substances are acids and which are bases.
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DEFINITION:-
Universal indicator:- a mixture of dyes that changes colour gradually over a range of pH and is used as an indicator paper in testing for acid.
THEIR USES:-
It is used to test whether a solution is acid or a base.it changes colour according to the pH of the acidic or basic medium.
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