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Buffer pH Calculator

Science & Engineering

Henderson-Hasselbalch · pH=pKa+lg(A⁻/HA)

Quick Answer

Buffer pH Calculator: Henderson-Hasselbalch · pH=pKa+lg(A⁻/HA). Buffer pH Calculator uses standard science & engineering formulas to compute accurate results instantly.

How it works

  1. 1pH=pKa+lg([A⁻]/[HA])
  2. 2At 1:1, pH=pKa (buffer midpoint)
  3. 3Effective range is pKa±1 — outside it buffering collapses
  4. 4Pick the system whose pKa is closest to your target pH

System parameters

mol/L
mol/L
Buffer pH5.06
Ratio A⁻/HA：2.000
Buffer headroom：within range
Recipe: compute the ratio for your target pH, then fine-tune with a pH meter (activity coefficients and temperature shift the reading). Tris has a large d(pKa)/dT (−0.03/°C) — buffer made at room temp drifts in the fridge. Blood pH 7.4 is the bicarbonate system at work; pH <6.8 or >7.8 is life-threatening.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Buffer pH Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Buffer pH Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Henderson-Hasselbalch · pH=pKa+lg(A⁻/HA).
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Buffer pH Calculator formula

Buffer pH Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Buffer pH Calculator?
Open the page and fill in the input fields — results update automatically. Henderson-Hasselbalch · pH=pKa+lg(A⁻/HA).
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Buffer pH Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/buffer-ph

Results provided by this tool are for reference only and do not constitute professional advice.