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

pH indicator..the reference used of pH indicatorthe 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