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The Principle Of Ph Test Paper
Mar 24, 2018

The pH indicator paper contains three indicators, methyl red, bromocresol green, and thymol blue. Like methyl red, bromocresol green, thymol blue and phenolphthalein, they will change according to a certain rule in solutions with different pH values. The color change range of methyl red is pH 4.4 (red) - 6.2 (yellow), the color change range of bromocresol green is pH 3.6 (yellow) - 5.4 (green), and the color change range of thymol blue is pH 6 .7 (yellow) - 7.5 (blue). It is not difficult to understand that a pH test paper prepared by impregnating a neutral white test paper with a certain amount of methyl red plus quantitative bromocresol green plus quantitative thymol blue indicator can be used to determine the pH of the solution.

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