Texas Instruments
Texas Instruments: Diprotic Acid Lab and Easy Data
Maleic Acid gives an excellent diprotic acid titration curve showing both inflection points clearly for calculation of molecular weight.
University of Nebraska
Univ. Of Nebraska Lincoln: Titration of a Diprotic Acid
An experiment to identify an unknown diprotic acid using a CBL system. A brief discussion of diprotic acids is given.