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AquaData 1000 Series General Purpose pH Sensors

The Nature of pH
pH stands for “potential of hydrogen” and refers to the concentration of hydrogen ions (H+) in water or whatever liquid is being measured. pH is a unit of measure for determining if a liquid is acidic or basic (alkaline). A liquid that is neither acidic nor basic is referred to as neutral.

pH is measured on a scale of 0.0 to 14.0. Measurements less than 7.0 are acidic, greater than 7.0 are base.

A pH of 7.0 indicates a neutral liquid. Pure water is neutral and the midpoint of the pH scale. Pure water consists of H20 molecules surrounded by a relatively small number of hydrogen ions and hydroxide ions (H+ and OH-).
Adding acids or bases to water changes its pH. Acids lower the pH of water by increasing the H+ concentration. Bases raise the pH of water by increasing the OH- concentration.