As far as I know pH-value is a dimensionless quantity and therefore has no unit.
It is dimensionless like other factors such as beta diversity or seed limitation
Mathematically, pH = -log[H +] and [H+] depend on whether the substance is weak or strong acid. Logarithms are series of Numbers and have no unitits!!
May be we should find why log has no unit!!
Actually pH express as negative logarithum of H ion activity so we not write unit, but pH unit is H ion concentration in gram mole /liter
pH is a logarithm (the negative of the logarithm of H+ activity), and as such it has no unit.
https://www.quora.com/What-is-the-unit-of-pH
No, any thing volum, concentration, weight or length we can not measure without unit, so pH has unit
No units
Negative log of H ion concentration
Yes concentration is measured in Moles/liter
It is the negative of the base 10 logarithm of the activity of the hydrogen ion.
Because 0 = log10(1), we can conveniently pick log10(1) as the ordinate of a fixed point (1 M, pH = 0) on a straight-line semi–log plot that could conceptually be used for the conversion from a linear concentration scale [H3O+], given in terms of molarity (M); to the pH scale. The last is a decimal logarithmic scale (dimensionless). Mathematically, it is quite clear that the argument of the logarithmic function should be taken as dimensionless, just as for that of its inverse exponential function. Hence we may consistently write: pH = - log10(|[H3O+]|) = - log10(|[H3O+]|) - { - log10(|1 M|)} = - log10([H3O+]/M); where (obviously) [H3O+] ≡ |[H3O+]| M.
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