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Buffer effective

Over what range of pH is a HOCl - NaOCl buffer most effective?

pH 2.0 - pH 4.0
pH 7.5 - pH 9.5
pH 6.5 - pH 8.5
pH 6.5 - pH 9.5
pH 1.0 - pH 14.0

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Answer is the third option: pH6.5 - pH8.5