What is the pH of perchaloric acid?

What is the pH of perchaloric acid?

  1. perchaloric acid is an unknown substance,

  1. perchloric acid is a strong acid with the formula HClO4.

  1. See: Perchloric acid - Wikipedia
  2. with the exception of H2O, there is no pure substance that has a pH.


    The definition of pH states that is is a measure of the activity of the free H+ / H3O+ ions present in a solution with water as the solvent.
To be precise the pH of an aqueous solution is the negative decimal logarithm of the activity constant of the hydronium ions → pH= -log a(H3O+).
For diluted solutions a practical approximation normally used, which most times is written as: pH = -log [H3O+], which is wrong in math, because you can only take a logarithm of a number and not from something that has a dimension, like meter, second or mole/L.
It should be written as: pH = -log{[H3O+]/(1 mole/L)} so the term between { } resolves to a dimensionless number, a multiplication factor, say, m,
where [H3O+] = m * 1 mole/L.

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