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Chemistry · Glossary

What is The pH, precisely?

Definition 44.4 School Chemistry — Grades 1 to 12 · Chapter 44 — Acids and Bases: Ka and pKa

In a dilute aqueous solution, the pH is defined by

pH=−log⁡[HX3OX+]c∘,that is[HX3OX+]=c∘×10−pH,\mathrm{pH} = -\log\frac{[\ce{H3O+}]}{c^\circ}, \qquad\text{that is}\qquad [\ce{H3O+}] = c^\circ \times 10^{-\mathrm{pH}} ,

where log⁡\log is the decimal logarithm.

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