Formula
This calculator uses the equation below. Use it as a quick reference when checking setup before solving.
K_a = [H_3O^+][A^−] / [H A]Acid-Base Chemistry
Acid Dissociation Constant Calculator
Compute Acid Dissociation Constant using K_a = [H_3O^+][A^−] / [H A].
K_a = [H_3O^+][A^−] / [H A]
Run this calculator
Leave a nullable field blank to solve for it.
Variable glossary
H3O Concentration (h3o_concentration)
Input variable 'h3o_concentration' for Acid Dissociation Constant. Set one variable to null to solve for it.
Conjugate Base Concentration (conjugate_base_concentration)
Input variable 'conjugate_base_concentration' for Acid Dissociation Constant. Set one variable to null to solve for it.
Acid Concentration (acid_concentration)
Input variable 'acid_concentration' for Acid Dissociation Constant. Set one variable to null to solve for it.
K A (K_a)
Result variable 'K_a' for Acid Dissociation Constant. Set to null (or omit) to compute this value.
Worked example
Try these sample values to validate the setup, then replace inputs with your own conditions.
- h3o_concentration: 0.8
- conjugate_base_concentration: 1.8
- acid_concentration: 2.8
Frequently Asked Questions
What does the Acid Dissociation Constant calculator solve?
It solves Acid Dissociation Constant problems in acid-base chemistry using your provided inputs and computes unknown values when nullable fields are left blank.
Do I need to convert units before using this tool?
Use the unit toggles where available (for example K/C and L/mL). ChemGenius converts values to the calculator's base units automatically before solving.
Can I save this result in my workflow?
Yes. After computing a result, you can continue into ChemGenius workflows like protocol drafting or notes to keep your calculation context attached to downstream work.