pH is a measure of the acidity or the alkalinity of water soluble substances. pH means the potential of Hydrogen. The value can be represented by a number between 1 to 14. A value of 7 is considered neutral. A number below 7 (neutral) means that the substance is going towards the acidic spectrum. A value of 1 is most acidic, while a value above 7 indicates the substance is increasing in alkalinity. A value of 14 is the most alkaline.