| Name | Formula | Molecular weight (g/mol) | pKa |
| Monosodium phosphate (monohydrate) | NaH2PO4・H2O | 137.98 | 7.21 |
| Monosodium phosphate | NaH2PO4 | 119.98 | |
| Disodium phosphate | Na2HPO4 | 141.96 |