Sodium phosphate, monobasic
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Description
White, crystalline powder. Monobasic sodium phosphate, or MSP, is primarily used in baking powder. It also has applications in textile dyeing, electroplating and as a cleaner and emulsifier. In conservation, MSP has been used as a pH buffer in some enzyme-based cleaning gel mixtures (Chapman 1986).
Synonyms and Related Terms
MSP; sodium acid phosphate; sodium biphosphate; sodium orthophosphate; sodium dihydrogen phosphate; monosodium dihydrogen phosphate
Risks
- May be harmful by ingestion.
- Contact may cause irritation.
Physical and Chemical Properties
Soluble in water forming sodium metaphosphate at 350-400 C. pH =4.4 - 4.5 for a 1% solution. Insoluble in ethanol.
| Composition | NaH2PO4 - H2O |
|---|---|
| CAS | 7558-80-7 |
| Density | 2.040 g/ml |
| Molecular Weight | mol. wt. = 119.98 |
| Refractive Index | 1.4401, 1.4629, 1.4815 |
Resources and Citations
- V. Chapman, "Amylase in a viscous medium: textile applications", The Conservator, no. 10 1986, pp. 7-11.
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8806
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index = 1.4401, 1.4629, 1.4815