HEIGHT MEASUREMENTS OF THE SPECTRUM AS AN ALTERNATIVE TO CONVENTIONAL SPECTROPHOTOMETRIC ANALYSIS OF A KMnO-K2Cr2O7 MIXTURE

Abstract

Quantitative spectrophotometric analysis is generally carried out plotting the absorbance against concentration, for some concentration range, in accordance with Lambert, Bourger, and Bee law. In this work, height measurement of the spectrum was used to analyze KMn04 and K2Cr2O7 mixtures in two different known concentrations. The experiments were relatively simple to carry out, requiring only standard solutions of KMn04, K2Cr2O7, sample mixtures of the two components, a visible light spectrophotometer, recorder, ruler, and pencil. Comparison of the two methods showed that the height measurement method is more reliable and versatile as it has no requirement for the calculation of molar absorptivity, shows less relative error than the conventional method.