What are maddreall's salts
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Answer:
Additional Names: Polymeric sodium metaphosphate
Literature References: Upon heating NaH2PO4 or NaNH4HPO4 to 250° and then slowly to 350°, first Na2H2P2O7 and then the insol Maddrell's salt is obtained, which is stable to about 500°; at 505° it changes to sodium trimetaphosphate, and above 607° to sodium hexametaphosphate. According to Maddrell, Ann. 61, 63 (1847) the salt may be prepd by heating two parts NaNO3 with one part H3PO4.
Properties: White powder. Practically insol in water and in aq solns of pyrophosphates and hexametaphosphates. Sol in mineral acids. Does not form complexes with Fe(II), Fe(III), U(IV) salts.
Use: In dentifrices, polishing agents, abrasive detergents.
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