Acid Dissociation Constant icon
pH Calculator icon

TOOL

pH calculator and acid dissociation constants

Chemical Suite includes three utilities related to pH and acid-base equilibrium: an acid dissociation constants database (Ka, Kb, pKa, pKb), a pH calculator, and a buffer solution calculator (Henderson-Hasselbalch).

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Acid dissociation constants

Look up Ka, Kb, pKa, and pKb from a list of numerous compounds, or convert any of these four values to the other three.

List of compounds

Look up Ka, Kb, pKa, and pKb from a list of numerous compounds.

Conversion between values

Enter one value — Ka, Kb, pKa, or pKb — and calculate the other three.

pH calculator

Calculate pH, pOH, [H⁺], and [OH⁻] from any of these four values, or from the acid or base type and its concentration.

From H⁺, pH, pOH, or OH⁻

Enter the H⁺ concentration, the pH, the pOH, or the OH⁻ concentration and get the other three values.

From acid/base type and concentration

Select the acid or base type and enter its concentration (mol/L) to calculate pH, pOH, [H⁺], and [OH⁻].

pH = −log[H⁺] pOH = −log[OH⁻] pH + pOH = 14 (at 25 °C)

Buffer solution (Henderson-Hasselbalch)

Calculate the pH of a buffer solution by applying the Henderson-Hasselbalch equation.

pH = pKa + log([A⁻] / [HA])

How it works in the app

Solve any pH problem in seconds

Download Chemical Suite for free and calculate pH, pOH, pKa, and pKb offline.

Get it on Google Play