HEIGHT MEASUREMENTS OF THE SPECTRUM AS AN ALTERNATIVE TO CONVENTIONAL SPECTROPHOTOMETRIC ANALYSIS OF A KMnO<sub>4</sub>K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> MIXTURE
Abstract:
Quantitative spectrophotometric analysis is generally carried out plotting 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 analyse KMn0<sub>4</sub> and K<sub>2</sub>Cr<sub>2</sub>0<sub>7</sub> mixtures in two different known concentrations. The experiments were relatively simple to carry out, requiring only standard solutions of KMn0<sub>4</sub>, K<sub>2</sub>Cr<sub>2</sub>0<sub>7</sub>, 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.
Quantitative spectrophotometric analysis is generally carried out plotting 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 analyse KMn0<sub>4</sub> and K<sub>2</sub>Cr<sub>2</sub>0<sub>7</sub> mixtures in two different known concentrations. The experiments were relatively simple to carry out, requiring only standard solutions of KMn0<sub>4</sub>, K<sub>2</sub>Cr<sub>2</sub>0<sub>7</sub>, 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.
DOI: 10.48141/SBJCHEM.v7.n8.1999.87_1999.pdf
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