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Acids, Alkalis, and the pH Scale - Compound Interest The 'H' in pH stands for the element, hydrogen. On a simple level, the pH scale can be thought of as a ranking of the amount of hydrogen ions in a solution: the more hydrogen ions, the lower the pH number. The 'p' in pH, to chemists at least, stands for the mathematical operation '-log 10 '. pH, then, is simply equal to -log 10 [H ... PDF Investigation 1 Create Your Own pH Scale! - Monterey Bay Aquarium Use a pipet to add 1 mL of the "pH 1" solution (0.1M HCl) to the water, diluting the acid to 0.01M. Pour this solution into another screw top vial and label it "pH 2." Screw the top tightly on the vial and gently shake to mix the contents. Unscrew top after mixing. Rinse the graduated cylinder and pipet with distilled water. The pH scale - Energy Education To calculate pH, you should know the concentration of hydrogen ions (H +) in your solution. From there, the pH can be found b...