title: A new sensor for thermometric titrations.
abstract: A new thermometric sensor, which is a transistor (OC71), has been introduced to follow thermometric titrations successfully to clear end points. The sensor was suitable in both normal and differential modes of titration. It is possible to titrate down to 1.32micromol of HCl and 26.4micromol of H(3)BO(3)in a final 20ml solution with accuracy and precision of 1%, 2.2% and 1.4%, 2.2%, respectively. The sensor, in association with a pH glass electrode, was used for the determination of pK values of some well established weak acids such as, acetic acid (4.77), phosphoric acid (pK(1)=2.18, pK(2)=7.20 and pK(3)=12.32) as well as for a very weak acid of uncertain pK values H(3)BO(3) (pK(1)=9.20, pK(2)=12.7 and pK(3)=13.80). The sensor was also examined for kinetic catalytic determination of iron(III) in water, milk and pharmaceuticals.
authors.affiliation: Chemistry Department, Collage of Science, Sulaimani University, Kurdistan Region, Iraq. fadhilmn@yahoo.com
authors.forename: Fadhil M
authors.initials: FM
authors.lastname: Najib
authors.forename: Sardir
authors.initials: S
authors.lastname: Zewar
authors.forename: Ahmad M
authors.initials: AM
authors.lastname: Abdulla