Potentiometric and conductometric studies on the formation of thorium molybdates as a function of pH

Abstract

The formation of thorium molybdates obtained by interaction of thorium nitrate and sodium molybdate at specific pH levels 7.8, 5.5 and 4.1 have been studied by electrometric techniques involving pH and conductometric titrations. The well-defined inflections and breaks in titration curves provide cogent evidence for the formation of thorium normal-ThO2.2MoO3 and para-3ThO2.14MoO3 molybdates in the vicinity of pH 5.3 and 4.4, respectively. Analytical investigations on the precipitates of thorium molybdates have also been carried out, which support the electrometric results.

Keywords

• molybdates
• thorium molybdates
• electrometry