Analytical · Glossary
What is a Buffer Solution?
pH calibration standardAnalytical
A buffer solution has a stable, known pH and resists change, and is used to calibrate pH electrodes.
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Buffer Solution Explained
Two point calibration uses pH 7 and a buffer close to the process pH, such as 4 or 10. Buffer values change slightly with temperature, so meters correct them automatically.
Use fresh buffers; alkaline buffers absorb carbon dioxide from air and drift.
Buffer Solution: Typical Values
| pH 4.01 buffer | at 25 °C |
| pH 7.00 buffer | at 25 °C |
| pH 10.01 buffer | at 25 °C, least stable |
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Calculators for Buffer Solution
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Frequently Asked Questions
What is a Buffer Solution?
A buffer solution has a stable, known pH and resists change, and is used to calibrate pH electrodes.
Can buffers be reused?
No, contamination and carryover change them; discard after use.
Why rinse between buffers?
To avoid carrying one buffer into the next.
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