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PH Test Paper Using Method

est solution pH: take a small piece of test paper on the surface of the plate or a glass sheet, with clean, dry glass rod with dip to be liquid drip in the middle of the dipstick, observing the change of stability of color, and standard color contrast, determine the solution properties.

PH of the test gas: first with distilled water to test paper wet, sticky at one end of a glass rod, sending to Sheng to be measured gas container near the mouth, observe the color change, to measure gas properties. (test paper can't touch the device wall)