pH= -log [H+]
Units of [H+] mol per litre
Then why pH has no units?
pH= -log [H+]
Units of [H+] mol per litre
Then why pH has no units?
deeksha sharma , 15 Years ago
Grade 11
Physical Chemistry> equilibrium...
2 Answers
aditya suman
Last Activity: 15 Years ago
pH has no unit because it is a logarithmic value of H+ions
Concentration itself does have units, but pH really only looks at the power (or exponent) of the concentrations. And, for that reason the unit doesn't carry.
For example:
pH = - log [H30+] (mathematical definition)
= negative logarithm of the hydronium ion concentration.
What this means is that if a solution has a concentration of 10-7 M [H30+] or (0.0000001 moles per litre of the hydronium ion), the negative log of this number = 7. Therefore the pH = 7.
But it's not 7 moles per litre or 7 moles or any other transferable unit. It's just 7.
pH = - log [H30+] (mathematical definition)
= negative logarithm of the hydronium ion concentration.
What this means is that if a solution has a concentration of 10-7 M [H30+] or (0.0000001 moles per litre of the hydronium ion), the negative log of this number = 7. Therefore the pH = 7.
But it's not 7 moles per litre or 7 moles or any other transferable unit. It's just 7.
Ajay Kumar
Last Activity: 15 Years ago
pH has no unit because it's a it's a logarithmic scale, not a measurement like grams or degrees
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