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It tells about the degree of acidity or alkalinity of a substance.
The pH is a measure of the concentration of hydrogen ions present.
pH = - log10 [H+]
Example:
concentration of H+, [H+] = 0.010 M
pH = - log10 0.010
= 2
pH = 5
[H+] = 10-5 M
= 1 x 10 -5 M
pH = 3.5
[H+] = 10-3.5 M
= 3.2 x 10-4 M
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