Determination of Acid Dissociation Constant of Bromocresol Green, Phenolphtalein and Methyl Orange by a Novel Program in MATLAB Software and Changing Color of pH Paper

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Deilamy Rad Gohar; Hossein Khezri Parisa; Pykarimah Pegah; Elyasi Leila

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ISSN: 2588-4824

Journal Paper

Paper Information

Journal: Iranian Journal of Analytical Chemistry Year:2022 | Volume:9 | Issue:1 Page(s): 40-49

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Information Journal Paper

Title

Determination of Acid Dissociation Constant of Bromocresol Green, Phenolphtalein and Methyl Orange by a Novel Program in MATLAB Software and Changing Color of pH Paper

Author(s)

Deilamy Rad Gohar | Hossein Khezri Parisa | Pykarimah Pegah | Elyasi Leila | Issue Writer Certificate

Keywords

Acid dissociation constantQ4

Solution scanometric methodQ4

Chemometric methodQ4

MATLAB softwareQ4

Abstract

In this study, the Acid dissociation constants (pKa) of three indicators, bromocresol green, phenolphthalein and methyl orange, were determined by scanning the solution of indicators and deposited pH paper in these solutions (in each step of color-changing solution) and then chemometrics method. These methods are simple, fast, and inexpensive. For this reason, first, the vessels containing the indicator solution and pH paper (in each step of color-changing solution) were scanned by the scanner, and then the images of sample solutions and pH papers were transferred to a computer using Microsoft Photo Editor (Microsoft XP). RGB values were measured, in each pixel, with the image processing tool box of MATLAB. In MATLAB (2013) software, a novel program was written based on RGB values, for calculating pKa indicators. The agreement between obtained pKa by this method and values reported in the literature demonstrates the utility of the method here used.

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