Comparative Study on the Stability of Mn(III) Ion Prepared by Different Methods in H₂SO₄ and H₃PO₄ Media

Abstract

The time-periods required for the % of Mn(III) to disappear from the solution and the half-life of Mn(III) was studied in 7 mol dm^-3 H₂SO₄ and 7 mol dm^-3 H₃PO₄ media at ambient conditions at three different Mn(III) concentrations viz. 4.98, 1.94 and 1.04 mmol dm^-3 using spectrophotometric method. Half-life periods in the presence of 7 mol dm^-3 H₂SO₄ are more than those in presence of 7 mol dm^-3 H₃PO₄. The time-periods required for the 1% of Mn(III) to disappear that for H₂SO₄ medium from 1.94 mmol dm^-3, Mn(III) solutions prepared from solid form is about 20 days, 10 days for electro-generated Mn(III) and 6 days for chemical oxidation method.