Chemistry can not be separated from the solution, the solution has acid and alkali, the "ruler" of the pH of the test solution is "Guangfan pH test paper", which is a ready-made test paper. When used, tear off one piece and put it in the surface dish. A dry glass rod picks up a drop of the solution to be tested, drops it in the middle of the test paper, and then knows the acidity and alkalinity of the solution according to the color change of the test paper and the standard color chart. It is very convenient for the pH test paper according to the measurement accuracy. Can be divided into 0.2, 0.1, 0.01 or higher precision.
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