FORMALIN AND PARAFORMALDEHYDE AS END-POINT INDICATORS IN CATALYTIC THERMOMETRIC TITRIMETRY

The use of formalin solution as an end-point indicator in the titratio n of both acids and bases in aqueous solutions was investigated. In bo th instances, a lowering in temperature at the end-point, due to depol ymerization of poly(oxymethylene glycols), was observed. Endothermic e nd-points were also obtained by using paraformaldehyde as an end-point indicator in titrations of acids in aqueous solutions. The use of par aformaldehyde in the titration of very weak acids and of some sparingl y soluble acids solubilized in micellar suspensions of cationic deterg ents was also investigated.