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This article explains the concept of pH, how to find and calculate the pH, and how the pH formula and pH equation are used in chemistry! pH stand for the "power of hydrogen" and is a logarithmic scale for how acidic or basic water is. Low numbers are acidic, high numbers basic. In medical science, having the proper pH in the blood and other body fluids is essential for the body to function correctly. In agriculture, pH is used to determine the soil’s acidity and adjust the acidic content to make it suitable for growing specific crops. How is pH Measured [1-5] Formula pH is measured on a logarithmic scale. The formula for pH is pH = – log 10 [H +] Where [H +] is the hydrogen ion concentration. pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. The pH of water is a very important measurement concerning water quality.