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25 February, 22:46

Which will provide the most direct measure of pH by measuring the hydrogen ion concentration of a solution?

A. pH meter

B. litmus paper

C. phenolphthalein

D. bromthymol blue

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  1. 25 February, 23:15
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    A. pH meter is the instrument which will provide the most direct measure of pH by measuring the hydrogen ion concentration of a solution.

    Litmus paper is just a paper which changes color based on whether the solution is an acid or a base. Phenolphthalein is an indicator which changes color based on pH values. And bromthymol blue doesn't tell concentrations, it is just a pH indicator for weak acids and bases.
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