In chemistry, pH is a logarithmic scale used to measure the acidity or alkalinity of water soluble substances. pH stands for potential of Hydrogen. Thus, we can say that pH value is the value that tells us about the power of substance to loss or gain H+ ion. A pH value is a number from 1 to 14. pH value of 7 indicates it is neutral. Values below 7 indicate acidity which increases as the number decreases, 1 being the most acidic. Values above 7 indicate alkalinity which increases as the number increases, 14 being the most alkaline.
pH value of a solution is given by:
pH = -log((H+))
(H+) indicates the concentration of H+ ions in the solution.
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