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

Question

Quizplus · Accepted Answer

A HOCl - NaOCl buffer is effective in the pH range of about 6.5 to 8.5. This is because at lower pH values, the hypochlorous acid (HOCl) component of the buffer will be dominant, whereas at higher pH values, the hypochlorite ion (OCl-) will be dominant. The effectiveness of the buffer is optimized when the pH is close to the pKa value of the weak acid component, which in this case is around 7.5. Therefore, the best choice is C: pH 6.5 - pH 8.5.

Over What Range of PH Is a HOCl - NaOCl