pH 6.86 Buffer Solution at 25C is used as a standard reference solution for calibration qualification and monitoring of pH meters and electrodes. It is widely applied in pharmaceutical environmental food and general analytical laboratories.

Its purpose is to provide a stable and accurately known pH value of 6.86 at 25C for reliable and reproducible pH measurements. It can also be used as a controlreference for checking other buffer solutions.

It is typically a phosphate buffer containing potassium dihydrogen phosphate and disodium hydrogen phosphate standardized to pH 6.86 at 25C. The solution is generally clear and colorless with certifiedtraceable values for analytical calibration.