Question

give the logarithmic definition of pH

Answer 1

Under normal circumstances thismeans that the concentration of hydrogen ions in acidic solution can be taken to be equal to the concentration of the acid. The pH is then equal to minus the logarithm of the concentration value. ... This is clearly wrong as an acid solution should have a pH of less than 7.

Answer 2

Under normal circumstances this means that the concentration of hydrogen ions in acidic solution can be taken to be equal to the concentration of the acid. The pH is then equal to minus thelogarithm of the concentration value. ... From the definition of p[OH] above, this means that the pH is equal to about 12.