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砷酸鈉

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砷酸鈉是一種無機化合物,化學式為Na3AsO4

製備

砷酸鈉可由砷酸(或五氧化二砷[2])和氫氧化鈉反應得到,從pH=11的溶液中可析出十二水合物:

H3AsO4 + 3 NaOH → Na3AsO4 + 3 H2O

或由偏亞砷酸鈉在水中經過氧化鈉氧化得到。[3]它也可以從紅砷鎳礦中用硝酸鈉氫氧化鈉提取出來:[4]

2 NiAs + 7 NaNO3 + 6 NaOH → 2 NiO + 2 Na3AsO4 + 7 NaNO2 + 3 H2O

性質

砷酸鈉和金屬鹽在氨的存在下反應,可以得到相應的氨配鹽[M(NH3)6]AsO4(M=Sc, Y, La, Cr, Co, Fe)。[5]它可以被甲醛還原為單質[6]

參考文獻

  1. ^ 1.0 1.1 Buketov, E. A.; Polukarov, A. N.; Isabaev, S. M.; Zhambekov, M. I. Thermal stability of sodium arsenates. Vestnik Akademii Nauk Kazakhskoi SSR, 1973. 29 (6): 30-33. ISSN: 0002-3213.
  2. ^ Sagadieva, A. K.; Makhmetov, M. Zh.; Kozorin, L. G. Crystal hydrates of sodium arsenate (Na3AsO4). Zhurnal Neorganicheskoi Khimii, 1980. 25 (4): 1129-1132. ISSN: 0044-457X.
  3. ^ Chavchanidze, N. G.; Giuashvili, I. I.; Ugulava, M. M.; Gigauri, R. D. Preparation of alkali metal arsenates. Zhurnal Neorganicheskoi Khimii, 1990. 35 (4): 1074-1076. ISSN: 0044-457X.
  4. ^ Fester, G. A. Sodium arsenate from nickel arsenides. Rev. fac. ing. quim., 1956. 25: 143-151. CAN52: 10344.
  5. ^ Kekenadze, M.; Rusia, M.; Kutsia, L.; Dzotsenidze, Z.; Gigauri, R. Synthesis and study of ammines of d-​metals' (III) tetraoxoarsenates. Bulletin of the Georgian Academy of Sciences, 2000. 162 (2): 265-268. ISSN: 1560-0262.
  6. ^ Bugenov, E. S.; Savel'ev, A. E. Mechanism of homogeneous reduction of arsenate ions with Formalin. Kompleksnoe Ispol'zovanie Mineral'nogo Syr'ya, 1979. 4: 22-28. ISSN: 0202-1382.
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砷酸鈉
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