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Solution: At calculations round to the subjects acid-base chemistry has one it very often with very small concentrations to doing, this corresponds to also the laboratory everyday life. Usually, the concentrations move somewhere in the millimeter range. Are well, you know, additionally the concentrations the H3O+ considered, so are these often still small, z.B. 0.00001 mol/l or 0.000001 mol/l. Which of the two concentrations is less? And you may have made the mistake of counting the zeros… tediously. If we take the logarithm and multiply it by -1, we get a size that is much more intuitive even in everyday laboratory life.
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