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Copyright 1999 AquaChem Publishing by Kevin J. Ruff
How pH Testing Works The most common pH test kits are the "wet" type. With this type, you place a known volume of aquarium water (usually 4-6 milliliters) in a clear test vial. Two or three drops of a pH dependent color indicator is then added to the test vial. The resulting color of the solution is then compared to a color gradient pH chart to determine the pH. Variants of these types of kits also exist in which the liquid indicator is replaced by a powdered, granular, or tablet form of indicator. Another type of test kit is that of the "dry" type. To use this kit you simply dip a test strip in a sample of aquarium water. These test strips are coated with a pH dependent color indicator. Similar to that of the wet kits, the resulting color of the test strip is compared to a color gradient pH chart to determine the pH. ............ |