What is the full meaning of PH in chemistry?

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Aless Harley answered
PH is defined as -log[H+]
It tells you how acidic or alkaline a solution is. A pH of 7 is neutral. Acids have a pH of 1 to 7. Alkaline substances have a pH of 7 to 14. The lower the pH the more acidic it is, and the higher the pH the more alkaline it is. PH depends on the amount a solution dissociates into H+ ions and it's salt. The more an acid dissociates, the lower it's pH, as the strength of an acid is determined by the amount it dissociates in solution.

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