Sodium hexametaphosphate

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Sodium hexametaphosphate (SHMP) is a salt of composition Na6[(PO3)6]. Sodium hexametaphosphate of technical grade is typically a mixture of metaphosphates (empirical formula: NaPO3), of which the hexamer is one, and is usually the compound referred to by this name. Such a mixture is more correctly termed sodium polymetaphosphate. They are also known as sodium polyphosphate or Graham's salt, from the Scottish chemist Thomas Graham, who coined the name sodium metaphosphate. They are white solids that dissolve in water.

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