Henderson-Hasselbalch Buffer Recipe & Concentration Table

Henderson-Hasselbalch Buffer Recipe & Concentration Table | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Health
Input types: select, number
Output type: html
Sample coverage: 4
API ready: Yes

Overview

The Henderson-Hasselbalch Buffer Recipe & Concentration Table calculator determines precise acid and base component ratios, weighable reagent masses, temperature-adjusted pKa values, buffer capacity, and ionic strength across eight standard bench buffer systems.

When to use

Preparing biological or biochemical buffers with exact target pH, concentration, and volume requirements.
Formulating cold-room assays or high-temperature reactions where temperature-dependent pKa shifts alter buffer ratios.
Estimating solution ionic strength and buffer capacity to avoid salt interference in downstream enzymatic assays.

How it works

1Select your target buffer system from eight bench options, including Phosphate, Tris, HEPES, MES, MOPS, Acetate, Citrate, or Carbonate.
2Enter the target pH, desired molar concentration in mM, total final preparation volume in mL, and planned working temperature in °C.
3The tool applies temperature coefficients to compute the effective pKa and calculates the equilibrium acid-to-base ratio via the Henderson-Hasselbalch equation.
4Review the resulting concentration table displaying individual component molarities, required dry masses to weigh out, buffer capacity (β), and estimated ionic strength.

Use cases

Formulating Sørensen phosphate buffer stock solutions for physiological cell assays and histology washes.
Calculating Tris-HCl base and acid salt weights adjusted for 4 °C protein purification chromatography protocols.
Mixing HEPES or MOPS biological buffers at specified ionic strengths for cell culture and enzyme kinetics.

Examples

1. Formulating 100 mM Phosphate Buffer at pH 7.4

Biochemistry Lab Technician

Background

A technician needs to prepare 1 L of phosphate buffer for protein wash steps at 25 °C without iterative acid-base titrations.

Problem

Calculate the exact dry masses of monobasic and dibasic sodium phosphate needed to reach pH 7.4 directly.

How to use

Select Phosphate buffer, enter 7.4 as the target pH, 100 mM concentration, 1000 mL volume, and 25 °C temperature.

Outcome

Obtains the 60.8% dibasic to 39.2% monobasic split with exact reagent masses (10.82 g Na₂HPO₄·2H₂O and 5.41 g NaH₂PO₄·H₂O), a buffer capacity of 0.055 M/pH, and an estimated ionic strength of 0.222 M.

2. Cold-Room Tris-HCl Preparation for Chromatography

Protein Purification Scientist

Background

A scientist is setting up an affinity column running in a 4 °C cold room where Tris exhibits significant pKa temperature drift.

Problem

Determine the altered Tris base and Tris-HCl ratio needed to maintain pH 8.0 at 4 °C instead of room temperature.

How to use

Select Tris buffer, enter target pH 8.0, concentration 500 mM, volume 500 mL, and temperature 4 °C.

FAQ

Which buffer systems are supported by this calculator?

The calculator supports eight systems: Acetate, Citrate, MES, Phosphate (Sørensen pair), MOPS, HEPES, Tris, and Bicarbonate/Carbonate.

How does working temperature affect the buffer recipe?

Buffer pKa values shift with temperature according to system-specific temperature coefficients, altering the required base-to-acid ratio.

What is buffer capacity (β)?

Buffer capacity measures resistance to pH change per mole of added acid or base, reaching its maximum when target pH equals the system pKa.

Does the calculator account for ionic strength?

Yes, it estimates total ionic strength based on the dissociation charges and equilibrium concentrations of the conjugate acid-base species.

What is the recommended buffering range for these systems?

Buffer systems are generally effective within ±1.0 pH unit of their temperature-adjusted pKa value.

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Formulating 100 mM Phosphate Buffer at pH 7.4

2. Cold-Room Tris-HCl Preparation for Chromatography

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