pH indicator..the reference used of pH indicatorthe uses of pH indicator..要英语回答!!

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pH indicator..
the reference used of pH indicator
the uses of pH indicator..
要英语回答!!

A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH (acidity or alkalinity) of the solution can be determined easily.
so the uses of pH indicator means employ the pH indicator