Negative Log

Definition

In chemistry, negative log often refers to calculating pH values by taking the negative logarithm base 10 (-log) of the molar concentration of H+ ions.

Related terms

Logarithm: The power to which a base number must be raised to produce a given number.

pH:

A measure of how acidic or basic water is. It's calculated as the negative log of the concentration of H+ ions in solution.

pOH:

A measure of hydroxide ion (OH-) concentration. It's calculated as the negative log of OH- ion concentration.