pocket ph meter,
handy ph meter
Chemistry is inseparable from the solution. The "ruler" for testing pH of solution is "extensive pH test paper"". This is a ready-made test paper, when used, tear a drop, drop a drop of solution, from its color change, you can know the acidity of the solution, very convenient. PH test paper can be divided into 0.2 grades, 0.1, 0.01 or higher precision according to measurement accuracy
The PH test paper has three indicators: methyl red, bromine green, and phenol blue. Methyl red, bromocresol green, thymol blue and phenolphthalein as in solution of different pH were will change according to certain rules. The range of color change of methyl red is PH4.2 (red) --6.2 (yellow), and the range of discoloration of BR green is PH3.6 (yellow) --5.4 (green), and the range of discoloration is PH6.7 (yellow) and --7.5 (blue). It is not difficult to understand the pH value of the solution by using a quantitative indicator of methyl red plus quantitative br green and a mixed indicator of quantitative phenol blue. The PH test paper can be used to determine the pH of the solution after drying.
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