Henderson-Hasselbalch Calculator
Buffer pH from pKa and concentrations.
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Introduction
Henderson-Hasselbalch Calculator — Buffer pH from pKa and concentrations. Enter pKa, [A⁻] base conc., [HA] acid conc. to get an instant, accurate result.
Formula
pH = pKa + log₁₀([A⁻]/[HA]), for a buffer solution of a weak acid and its conjugate base.
Step-by-step
- Enter the pKa.
- Enter the [A⁻] base conc..
- Enter the [HA] acid conc..
- Click Calculate to see your result instantly.
Real-world example
Example: With pKa = 4.76, [A⁻] base conc. = 0.1, [HA] acid conc. = 0.1, the Henderson-Hasselbalch Calculator gives pH: 4.76.
Frequently Asked Questions
What does this calculator solve for?
The pH of a buffer solution given its pKa and the ratio of conjugate base to weak acid concentrations.
What happens when base and acid concentrations are equal?
The log term becomes zero, so pH equals pKa exactly.
What inputs does the Henderson-Hasselbalch Calculator need?
You'll need to provide: pKa, [A⁻] base conc., [HA] acid conc.. 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 Henderson-Hasselbalch Calculator?
The Henderson-Hasselbalch Calculator applies the formula exactly as calculated — pH = pKa + log₁₀([A⁻]/[HA]), for a buffer solution of a weak acid and its conjugate base. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Henderson-Hasselbalch Calculator free to use?
Yes, the Henderson-Hasselbalch Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Henderson-Hasselbalch Calculator
The Henderson-Hasselbalch Calculator uses a real, verifiable formula — pH = pKa + log₁₀([A⁻]/[HA]), for a buffer solution of a weak acid and its conjugate base. — so results are accurate every time, not an approximation.