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sodium metaphosphate

(NaPO3)x Sodium phosphate groupings; cyclic forms range from x _ 3 for the trimetaphosphate, to x _ 10 for the decametaphosphate; sodium hexametaphosphate with x _ 10 to 20 is probably a polymer; used for dental polishing, building detergents, and water softening, and as a sequestrant, emulsifier, and food additive.

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