Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Acid dissociation constant Ka

Required number input.

Compute the base dissociation constant from the acid dissociation constant as Kw divided by Ka. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Base dissociation constant Kb

The resulting base dissociation constant kb returned as a number.

• Concentration-based acid–base formulas usually approximate activities and may assume a fixed water ion product. Ionic strength, temperature, polyprotic equilibria, dilution volume, and activity coefficients can materially shift pH and speciation.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Ka From Kb

  Compute the acid dissociation constant from the base dissociation constant as Kw divided by Kb.

• Conjugate Acid Ka

  Compute the Ka of a conjugate acid from the Kb of its conjugate base as Kw divided by Kb.

• Conjugate Base Kb

  Compute the Kb of a conjugate base from the Ka of its conjugate acid as Kw divided by Ka.