definition of the pH value
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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. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water
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In chemistry pH is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solution are measured to have lower pH values than basic or alkaline solutions.The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution
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