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
Publish place: Iranian Journal of Analytical Chemistry، Vol: 9، Issue: 1
Publish Year: 1401
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJAC-9-1_004
تاریخ نمایه سازی: 1 مرداد 1401
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 (۲۰۱۳) 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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Authors
Gohar Deilamy-Rad
Department of Chemistry, Payame Noor University ۱۹۳۹۵-۴۶۹۷ Tehran, Iran
Parisa Hossein-Khezri,
Department of Chemistry, Payame Noor University ۱۹۳۹۵-۴۶۹۷ Tehran, Iran
Pegah Pykarimah
Department of Chemistry, Payame Noor University ۱۹۳۹۵-۴۶۹۷ Tehran, Iran
Leila Elyasi
Department of Chemistry, Payame Noor University ۱۹۳۹۵-۴۶۹۷ Tehran, Iran
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