Application of the aldehyde reactions for the endpoint detection in the catalytic thermometric titration of acids

Exothermic reaction of formaldehyde polymerization in alcoholic medium which is catalyzed by diluted solutions of strong bases was used for catalytic thermometric endpoint indication in titrations of organic acids. The amounts of 7.80–23.10 mg of various organic acids were determined with a relative standard deviation less than 0.9%. The developed method was successfully applied also to determination of free acid content (formic acid) in aqueous solutions of formaldehyde of various manufacturers.