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The p stands for "power". The H stands for hydrogen, as is common in chemistry; in this case, it specifically means the hydrogen ion H+, which in water actually exists as H.x(H2O)+, where x is generally 1 to 3 or so.

You will occasionally see the "p" notation in other things, and it generally means "the negative log to the base 10 of" whatever follows it. For example, pKa means the negative log to the base 10 of the acid dissociation constant.

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8y ago

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