PH

Overview

Engineering reference data for PH in chemistry.

Key Formulas

Ideal Gas Law

$PV = nRT$

Pressure × Volume = moles × gas constant × temperature.

Molarity

$M = \frac{n}{V}$

Moles of solute per liter of solution.

pH

$pH = -\log_{10}[H^+]$

Measure of acidity.

Variables

Symbol	Description	Unit
$P$	Pressure	Pa
$V$	Volume	m³
$n$	Moles	mol
$R$	Gas constant	8.314 J/(mol·K)

Formulas

The fundamental mathematical definitions of pH are:

$pH = -\log_{10}[H^+]$

or, using the hydronium ion representation:

$pH = -\log_{10}[H_3O^+]$

These formulas show that pH is a logarithmic scale. A change of one pH unit represents a tenfold change in hydrogen ion concentration.

Interactive Charts

References

• Original Source