Remove the test strip and immerse the test strip in the solution for one second to completely immerse all test areas. Remove the test strip. Shake off excess solution. Compare test areas and color ratios. Read the corresponding value.
Chemistry is inseparable from the solution, and the solution is divided into acid and alkali. The "ruler" for checking the pH of the solution is "Universal pH test paper", which is a ready-made test paper. When used, tear off one piece, put it in a watch glass, and take a drop of the test solution with a dry glass rod.
It is very convenient to know the acidity and alkalinity of the solution by dropping it in the middle of the test paper and then comparing it with the standard color chart according to the color change of the test paper.
The pH test paper can be divided into 0.2, 0.1, 0.01 or higher according to the measurement accuracy.
Check the pH of the solution: Take a small piece of test paper on the surface dish or glass piece, use a clean and dry glass rod to draw the liquid to be tested in the middle of the test paper, observe the color after the change is stable, compare with the standard color chart, judge the solution
