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pH is the negative logarithm, to the base ten, of the concentration of hydronium ions; in simple math terms, -log10[H3O+]. Another way to read this is that the concentration of hydronium is 10 to the power of pH, 10pH. It gives an indication of how many hydronium (and therefore hydrogen) ions are dissolved in the solution concerned; a larger number means less of it and vice versa.

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16y ago

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