Calculate hydrogen ion concentration from pH and the dissociation it implies.
Taking the antilog of the negative pH recovers hydrogen ion concentration. Even at pH 4.5 the concentration is only about 32 micromolar, yet that still corresponds to around 10¹⁹ protons per litre. The enormous particle count at tiny molar concentrations is why buffering works: small amounts of buffer can absorb large numbers of protons.
Hydrogen Ion
[H⁺] = 10^(−pH)
[H⁺] = 10^(−pH) Taking the antilog of the negative pH recovers hydrogen ion concentration. Even at pH 4.5 the concentration is only about 32 micromolar, yet that still corresponds to around 10¹⁹ protons per litre.
The enormous particle count at tiny molar concentrations is why buffering works: small amounts of buffer can absorb large numbers of protons.
This calculator takes 2 inputs: pH, Solution volume. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.