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Why is a logarithmic scale used to report hydronium ion concentrations?
ABecause the values are always whole
BBecause concentrations cannot be measured
CBecause the values span many orders of size
DBecause logarithms remove the need for units
Answer & Solution
Correct answer: C. Because the values span many orders of size
1. Hydronium concentrations in real solutions range across a huge span of magnitudes.
2. Writing them directly means carrying awkward powers of ten everywhere.
3. A logarithmic scale compresses that range into small, comparable numbers.
4. The p-function does exactly this, and pH is that function applied to hydronium ion molarity.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 14 "Acid-Base Equilibria", section 14.2 pH and pOH_
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