Is na2hpo4 and nah2po4 a buffer?

Yes, a mixture of Na2HPO4 (disodium hydrogen phosphate) and NaH2PO4 (sodium dihydrogen phosphate) can act as a buffer solution. This is because they are conjugate acid-base pairs, allowing the solution to resist changes in pH when small amounts of acid or base are added. The ratio of these two compounds can be adjusted to achieve a desired pH, typically around 7.2 to 8.2, making it useful in biological and chemical applications.