What Exactly Is pH?

Here’s a look at what acidity and alkalinity mean at the molecular level and how pH is measured, plus a few sample exam questions covering the topic.
What Exactly Is pH?
A schematic representation of the electron shell structure of hydrogen (not what the hydrogen atom actually looks like).

When operators are asked to define pH, many struggle to describe what it is and how it is measured. Let’s look at those matters — and explore how questions about pH might be worded on a wastewater licensing exam.

The technical definition of pH is: the logarithm of the...

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