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pH has become a unit of measure so commonplace that it is now even referred to in consumer household products such as cosmetics, shampoo, and even food / beverage. It is important to ask - what are we actually measuring when we refer to pH?

This group of articles serves as a primer for the non-chemist to understand the basis for pH measurement. The first two topics provide an overview of the pH scale and the Nernst Equation that relates the sensor’s output signal to the pH value. The second two articles dive into the chemistry of ions in liquid (specifically the hydrogen ion) as well as the definitions of well known liquids such as acids, bases, and salts.

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Get a better understanding of pH measurement in Hamilton’s comprehensive pH Measurement Guide.

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