Kobalt va nikel birikmalarining olinishi va xossalari

Xossalari:

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  Xossalari:
  
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  1. 2(CoIICoIII2)O4 = 6CoO + O2 (905 - 925 °C).
  
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  2. (CoIICoIII2)O4+ 8HCl(konst)= 3CoCl2 + Cl2 + 4H 2O,
  
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  2(CoIICoIII2)O4 + 6H 2SO4(konst) = 6CoSO4 + O2 + 6H 2O (qayn.).
  
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  3. 4(CoIICoIII2)O4+ 12NaOH + O2 = 12 NaCoO2(qizil) + 6H 2O (400 °C).
  
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  4. 4(CoIICoIII2)O4+ O2 + 6ZnO = 6(Co III 2Zn)O4(yashil) [800 °C].
  
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  5. (CoIICoIII2)O4+ 4H2 = 3Co + 4H 2O (120 - 500 °C).
  
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Co(OH)2- KOBALT (II)-GIDROKSID

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  Co(OH)2- KOBALT (II)-GIDROKSID
  
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  To`q-binafsha kristallar yoki ko`k amorf (yangi cho`ktirilgani). Kobalt (II) tuzlarining eritmasida uzoq turganda pushti-qizilga bo`yaladi. Nam holda havodan O2 va SO2 ni yutadi. Suvda erimaydi. Organik muhitda ko`k gidrati Co(OH)2 *0,67H 2O cho`kadi. Amfoterlik xossalarni namoyon etadi (asos xossalari ustunroq); suyultirilgan kislotalar, kontsentrlangan ishqorlar bilan reaktsiyaga kirishadi. Ammiak tasirida eritmaga o`tadi. Qaytaruvchi.
  
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  Mr = 92,95; d = 3,597; pЭK25 = 14,80.
  
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  Olinishi:
  
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  CoSO4(suyul) + 2NaOH(10% li) = Co(OH)2 + Na2SO4
  
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  {Co(NH3)6}Cl2 +2NaOH(suyult) + 6H2O =Co(OH)2 +2 NaCl +6 (NH3*H2O)
  

Xossalari:

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  Xossalari:
  
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  1. Co(OH)2 = CoO + H 2O (168 - 170 °C, vak.).
  
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  2. Co(OH)2 + 2HCl(suyul) = CoCl2 + 2H 2O.
  
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  3. Co(OH)2 + CoCl2(suyul) = CoCl(OH) (yashil),
  
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  Co(OH)2 + CoCl2(10% li) = Co 2Cl(OH)3 (pushti).
  
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  4. Co(OH)2 + 2NaOH(50%-li) Na 2[Co(OH)4](binafsha).
  
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  5. Co(OH)2 + 6(NH3 *H 2O)[konts.] = [Co(NH3) 6](OH)2(sariq) + 6H 2O.
  
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  6. 4Co(OH)2+ O2 = 4CoO(OH) + 2H2O (100 °C, p).
  
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  7. 2Co(OH)2(nam) + CO2= Co 2CO 3(OH)2+ H 2O.
  
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  8. 2Co(OH)2 + H 2O2(konts.) = 2CoO(OH) + 2H 2O (qayn.)
  
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  9. 2Co(OH)2+ E2 + 2NaOH(suyul.) = 2CoO(OH) + 2NaE + 2H 2O (E = Cl, Br).
  
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  10. 2Co(OH)2 + NaClO(to`yingan) = NaCl + H 2O + 2CoO(OH)
  
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  11. Co(OH)2 + 2Al(OH)3 = (CoAl2)O4(ko`k) + 4H 2O (600 - 800 °C).