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Which pH indicator is suitable for a base to acid reaction?
So I will be doing an experiment where bisulfite (weak acid) is converted into strong acid (hydrogen sulfate). At the moment, the indicator that I'm thinking of is either bromophenol blue with transition range of 3.0-4.6 or bromocresol purple (5.8-6.0). If there's any other suggestion for the pH indicator, I need one with drastic color change as the reaction that I'll be dealing with is a clock reaction to study the kinetic aspect of it.
1 Answer
- Mike ALv 77 years agoFavorite Answer
Do a preliminary potentiometric titration. That's one where you don't use an indicator but monitor and record the pH as you titrate. Its much more accurate than using an indicator and it tells you the exact pH range of your equivalence point in your system. You will then be in a position to select an indicator which changes colour at the correct value or to do all the determinations by the more accurate method.
