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pH is roughly minus log (molar concentration of hydrogen ions)

so pH=7 means molar concentration = 10^-7 M

This means that a pH of 0 corresponds to 1 mole per litre of hydrogen ions and that yes the pH can go negative.

e.g. 2 moles per liter of hydrogen ions means pH= -0.3

but clearly there is a limit to how many hydrogen ions you can fit in a liter.

10M HCl has a pH of -1

The most negative pH for a real solution that I could find is -3.6

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12y ago

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