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International Research Journal of Medical Sciences and Health Care

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QUANTITATIVE EVALUATION OF ACID-BASE DISSOCIATION IN METHYLORANGE AND METHYLRED

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KAZUYA TAKAHASHI 1 ,
4 Health Research Foundation, Research Institute for Production Development 4F, 15 Shimogamo-morimoto-cho, Sakyo-ku, Kyoto 606-0805, Japan

Abstract

This study presents a quantitative evaluation of the acid-base dissociation mechanisms in the dyes Methylorange and Methylred, which are commonly used as pH indicators in various chemical and biological applications. Using spectrophotometric techniques, the dissociation constants (pKa) of these dyes were determined across a range of pH levels. The research involved systematic measurements of absorbance changes in response to pH variations, allowing for precise calculation of the dissociation equilibria.

Methylorange, known for its sharp color transition between red and yellow, and Methylred, which transitions from red to yellow, were analyzed to compare their acid-base behavior and the impact of structural differences on their dissociation mechanisms. The study also examined the influence of ionic strength and solvent effects on the dissociation constants to better understand the environmental factors affecting the performance of these indicators.

The results indicate distinct dissociation profiles for Methylorange and Methylred, with Methylorange exhibiting a more pronounced pH-dependent color change compared to Methylred. The findings provide valuable insights into the practical applications of these dyes in pH measurement and their behavior under different conditions. This quantitative assessment not only enhances the understanding of the acid-base chemistry of these indicators but also informs their optimal use in various scientific and industrial contexts.

Keywords

Acid-Base Dissociation, Methylorange, Methylred, Spectrophotometry

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