Formula Na3P3O9 Density 2.49 g/cm³ | Molar mass 305.885 g/mol | |
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Appearance colorless or white crystals | ||
Sodium trimetaphosphate (also STMP), with formula Na3P3O9, is a metaphosphate of sodium. It has the empirical formula NaPO3. It is the sodium salt of trimetaphosphoric acid. It is a colourless solid that finds specialised applications in food and construction industries. STMP is prepared by heating sodium polyphosphate at a few hundred degrees.
Although drawn with a particular resonance structure, the trianion has D3d symmetry.
References
Sodium trimetaphosphate Wikipedia(Text) CC BY-SA