Adaro, Tewodros (2010) Spectroscopic pH Measurement Using Phenol Red Dye. Masters thesis, Addis Ababa University.
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Abstract
The optical spectroscopic technique using phenol red dye was used to measure pH. Buffer solutions having known pH values were used to characterize phenol red equilibrium dissociation constant. Optical (Absorption) spectra of phenol red in these buffer solutions were used to calibrate the dye equilibrium dissociation constant. ݇Ļ of phenol red was found to be 7.89511. Once the dye equilibrium dissociation constant has been characterized, pH of unknown solutions can be obtained from their dye spectra. Using this method pH of caffeine and five different types of packed drinking spring water is calculated. The error of this method is found to be 0.005 pH unit.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics Q Science > QD Chemistry |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 24 May 2018 12:39 |
| Last Modified: | 24 May 2018 12:39 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4081 |
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