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Its hydrogen ion concentration determines whether a solution is to be acidic (pH below 7) or basic (pH higher than 7.0) .

Acidic: [H+] > [OH-] , or pH < 7.0 in water at 25 oC

Basic : [H+] < [OH-] , or pH > 7.0 in water at 25 oC

In between is neutral: [H+] = [OH-] = 1.0*10-7, or pH = 7.0 in water at 25 oC

Note:

Remember that (always, by definition) pH = - log[H+] and[H+] = 10-pH

and [H+] * [OH-] = 10-14 (or pH + pOH = 14.0) in water at 25oC

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