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Quote from: Potatomuffin on May 25, 2010, 11:07:31 PMUse Methyl Orange. The pH change should be sharp so determine the endpoint based on the immediate change to pumpkin orange.pH changes pH during EDTA titration? No idea what you refer to.
Use Methyl Orange. The pH change should be sharp so determine the endpoint based on the immediate change to pumpkin orange.
They were talking about back titration from the USP monograph, not the EDTA anymore.
I had previously perused the USP (...) the approach is similar chemically
hit it with an excess of an EDTA salt, add about 100 ml of IPA and back titrate with aqueous mag chloride.