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

Have questions? Check out the FAQ.