Sodium metaphosphate
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Description
A small polymer, usually 3 to 20 units, of sodium phosphate. Small very long chains form vitreous compounds. Sodium metaphosphate is used as water softeners, sequestrants, detergents (Calgon®), emulsifiers, corrosion inhibitors, and dental abrasives.
Synonyms and Related Terms
sodium hexametaphosphate; sodium trimetaphosphate; sodium polyphosphate; Maddrell's salt; Calgon; Graham's salts
Risks
- Skin contact can cause irritation.
- Phosphates can be detrimental to the environment.
- Fisher Scientific: MSDS
Physical and Chemical Properties
pH of aqueous solution = 6.0 - 7.7
| Composition | [NaPO3]n |
|---|---|
| CAS | 10124-56-8 |
| Melting Point | 1184 C |
| Density | 2.18 G/ml |
| Molecular Weight | mol. wt. = 611.77 |
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8787