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RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Sample of a buffer solution (pH 7) being poured from a measuring cylinder into a beaker. The green colour is due to universal indicator. A buffer is a solution that resists changes to its pH. Typically it contains a weak acid and a salt of the acid, and the equilibrium between them adjusts when acid or alkali is added, maintaining a constant pH.
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