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PH test paper notes

The test does not directly into the solution.

Test paper can not measure the concentration of sulfuric acid pH.

The test does not contact the tube, bottle, pipe mouth etc..

When the pH of the solution is determined, the test paper can not be wetted with distilled water in advance, because the wetting test paper is equivalent to the solution which is tested by dilution, which can lead to inaccurate measurement. With a dip to be measured solution glass rod drop in the middle part of the test paper, discoloration test paper, again with the standard colorimetric card is compared to determine the solution pH is the right way.

Remove the test strip, a test strip container should be tightly covered, lest some laboratory gas contamination

Must be used at room temperature, otherwise it will lead to inaccurate results.