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
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.
pH is negative logarithm of hydrogen ion concentration I.e. [H+]...
The brackets [ ] is generally used to show concentration means what is the concentration of hydrogen ion in the solution say water or soil solution or blood or any other liquid which is aqueous (neither solid nor gas completely devoid of water or moisture)
Hydrogen ion concentration is calculated as mole per liter or say H+/L
But generally unit is not mentioned in pH as if we say this soil solution have 5 pH, it means this is 10 times more acidic than pH 6 and 10 times more basic than pH 4...
We don't use any of the unit while expressing pH ...but unit is mole per liter
Also in case of hydroxyl ions we used to write like [OH-] which also tells about mole of hydroxyl ions in the solution of one liter...
Any logarithm is a proportionate or relative quantity and so, effectively, when it is generated the units cancel.
pH has no units.
YES it does...anything that is physically measured MUST have a unit!
From the definition of it, it measured concentration of dissolved H+ into a liquid solution! Unit=moles h+/liter!!!!
We simple use conventionally unit-less number, for convenience!
i.e. instead of reporting that the pH is 10E-6 moles of H/liter of soil solution we ..simple say ph=6!
Common sense...not much science!!!
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