Kb Calculator
Calculate the base dissociation constant Kb from equilibrium concentrations or pKb.
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Introduction
Kb Calculator — Calculate the base dissociation constant Kb from equilibrium concentrations or pKb. Enter Given, [BH⁺] (mol/L), [OH⁻] (mol/L), [B] (mol/L) to get an instant, accurate result.
Formula
Kb = [BH⁺][OH⁻] / [B] at equilibrium for a weak base B + H₂O ⇌ BH⁺ + OH⁻. Equivalently, Kb = 10^(−pKb).
Step-by-step
- Enter the Given.
- Enter the [BH⁺] (mol/L).
- Enter the [OH⁻] (mol/L).
- Enter the [B] (mol/L).
- Click Calculate to see your result instantly.
Real-world example
Example: With Given = concs, [BH⁺] (mol/L) = 0.001, [OH⁻] (mol/L) = 0.001, [B] (mol/L) = 0.1, the Kb Calculator gives Unknown: kb, Kb: 0.00001.
Frequently Asked Questions
What does a larger Kb mean?
A larger Kb indicates a stronger base — more of it ionizes to produce BH⁺ and OH⁻ at equilibrium.
How are Ka and Kb of a conjugate pair related?
For a conjugate acid-base pair, Ka × Kb = Kw = 1.0×10⁻¹⁴ at 25°C.
What inputs does the Kb Calculator need?
You'll need to provide: Given, [BH⁺] (mol/L), [OH⁻] (mol/L), [B] (mol/L). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Kb Calculator?
The Kb Calculator applies the formula exactly as calculated — Kb = [BH⁺][OH⁻] / [B] at equilibrium for a weak base B + H₂O ⇌ BH⁺ + OH⁻. Equivalently, Kb = 10^(−pKb). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Kb Calculator free to use?
Yes, the Kb Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Kb Calculator
The Kb Calculator uses a real, verifiable formula — Kb = [BH⁺][OH⁻] / [B] at equilibrium for a weak base B + H₂O ⇌ BH⁺ + OH⁻. Equivalently, Kb = 10^(−pKb). — so results are accurate every time, not an approximation.