Sodium phosphate, monobasic

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

Other 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
Molecular Weight	mol. wt. = 119.98
Refractive Index	1.4401, 1.4629, 1.4815

Hazards and Safety

May be harmful by ingestion. Contact may cause irritation.

Mallinckrodt Baker: MSDS

Additional Information

V. Chapman, "Amylase in a viscous medium: textile applications", The Conservator, no. 10 1986, pp. 7-11.

Authority

• 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