pH is a figure that represents potential hydrogen, and is the measure of acidity or alkalinity in any water-soluble substance. pH values are represented on a logarithmic scale with numbers 1-14 with 7 being a neutral point. Values below 7 indicate acidity with lower numbers indicating greater acidity. Numbers higher than 7 indicate alkalinity with higher numbers indicating greater alkalinity.
pH is the balance between hydrogen ions and hydroxide ions. Ions are atoms that have lost or gained an electron and hold a positive or negative charge. Everything has a pH value that can be measured. Determining the pH of a particular substance has a number of important applications, such as determining soil quality by it's acidity or alkalinity.
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