Does anyone know a method for measuring the concentration of HOCl in a NaClO solution?

Melanie LeVonne Grant @Melanie-Grant-2

21 April 2014 1 833 Report

Has anybody measured the HOCl concentration in a NaClO solution? Do you have a good method?

Dávid Andrási

Just some ideas, I hope some of them can be used:

1. direct potentiometric measurement by pH-electrode (for dilute solutions)

2. measuring pH in a series of dilution, by knowing pK of HOCl and OCl calculation may give concentration.

3. decompose of OCl and HOCl by H2O2, and then measuring acidity by titration or potentiometry (mainly NaCl and HCl forms during reaction)

Appropriate method depends on the properties of you solution (concentration, other constituents etc.)

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