Definition of self indicator
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Indicators are substances that
change color when they are added to acidic or alkaline solutions. The
litmus indicator turns red in acidic solutions and blue in alkaline
solutions. Universal indicator is a mixture of several different
indicators. Universal indicator can exactly determine how strongly
acidic or alkaline a particular solution is. In strongly acidic
solutions, the universal indicator turns red whereas in strongly
alkaline solutions, the universal indicator turns dark purple. In a
neutral solution, the universal indicator turns green.An
indicator is used in titration to determine the endpoint of a reaction.
Titration is a laboratory technique that is used to determine the
unknown concentration of a reactant. As titration is a delicate process,
indicators must be chosen carefully by taking into consideration the pH
at the equivalence point of a titration. Methyl orange is an indicator
whose color changes from red to orange in the acidic pH range of 3.1 to
4.4. Phenolphthalein is an indicator whose color changes from colorless
to pink in the alkaline pH range of 8.0 to 10.0
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