pH of 7 is considered neutral (e.g., pure water). It's used in cooking (e.g., reacting baking powder and an acid to make baked goods rise), to design cocktails, in cleaners, and in food preservation. pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion into numbers between 0 and 14. pH is used in everyday life as well as science and industry. Learn more about pH. Typically, values of pH range from 0 to 14, although very strong acids may have a negative pH, while very strong bases may have a pH … Technically, pH is a gauge of the hydrogen-ion concentration (potential Hydrogen) in a substance.For the gardener's needs, it is enough to know whether your soil is alkaline or acidic because certain nutrients can only be accessed by plants when the soil pH falls into an acceptable range and no amount of fertilizer is going to improve their health until the pH has n adjusted. Definition of pH scale: A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen').

A pH value is a number from 1 to 14, with 7 as the middle (neutral) point. pH describes how acidic or basic an aqueous solution is, where a pH below 7 is acidic and a pH greater than 7 is basic.

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