pH Buffers for Titration

Buffers keep the pH within a specified range, an important consideration for chemical and biochemical reactions that occur in aqueous solution. Buffers are typically mixtures of weak acids or bases with their salts or the salts of multi-alkaline acids. By dissolving these buffer substances in water that is free of salts and carbon dioxide, buffer solutions are created with reproducible pH values that remain stable for long periods.
The accuracy of Sigma-Aldrich buffer solutions is ensured by careful choice of the buffer substances, the use of deionized water with extremely low conductivity and subsequent calibration of the pH value with standard buffer solutions to DIN 19266.