Abstract
Indicators and electrode systems for the titration of weak acids in 1,1,3,3-tetramethylguanidine as solvent have been investigated. A glass electrode coupled with a silver-silver bromide reference is found to give the most reliable results. Alizarin yellow and azo violet give results in agreement with potentiometric end-point values. A large potassium ion effect is observed in this solvent. Attempts to differentiate several pairs of acids were unsuccessful, because the solvent showed a strong leveling effect.
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