Useful equations for transition metal reactions

  • [M(H2O)6]2+(aq) + H2O(l)  ⇌ [M(OH)(H2O)5]+(aq) + H3O+(aq)
  • [M(H2O)6]3+(aq) + H2O(l) ⇌   [M(OH)(H2O)5]2+(aq) + H3O+(aq)
  1. [Co(H2O)6]2+(aq) + 2OH¯(aq) ——> [Co(OH)2(H2O)4](s) + 2H2O(l)
  2. [Co(H2O)6]2+(aq) + 2NH3(aq) ——> [Co(OH)2(H2O)4](s) + 2NH4+(aq)
  3. [Co(OH)2(H2O)4](s) + 6NH3(aq) ——> [Co(NH3)6]2+(aq) + 4H2O(l) + 2OH¯(aq)
  4. [Co(NH3)6]2+(aq) ——> [Co(NH3)6]3+(aq) + e¯
  5. [Co(H2O)6]<sup>2+</sup> (aq) + CO3(aq) ——> CoCO3(s) + 6H2O(l) or Co2+(aq) + CO32-(aq) ——> CoCO3(s)
  6. [Co(H2O)6]2+(aq) + 4Cl¯(aq) ——> [CoCl4]2-(aq) + 6H2O(l)
  7. [Cu(OH)2(H2O)4](s) + 4NH3(aq) ——> [Cu(NH3)4 (H2O)2 ]2+(aq) + 2H2O(l) + 2OH¯(aq)
  8. 2Cu2+(aq) + 4I¯(aq) ——> 2CuI(s) + I2(aq)
  9. [Cr(H2O)6]3+(aq) + 3OH¯(aq) ——> [Cr(OH)3(H2O)3](s) + 3H2O(l)
  10. [Cr(OH)3(H2O)3](s) + 3H+ (aq) ——> [Cr(H2O)6]3+(aq)
  11. [Cr(OH)3(H2O)3](s) + 3OH¯(aq) ——> [Cr(OH)6]3-(aq) + 3H2O(l)
  12. 2 [Cr(H2O)6]3+(aq) + 3CO32-(aq) ——> 2 [Cr(OH)3(H2O)3](s) + 3H2O(l) + 3CO2(g)
  13. [Cr(H2O)6]3+(aq) + 3NH3(aq) ——> [Cr(OH)3(H2O)3](s) + 3NH4+(aq)
  14. [Cr(OH)3(H2O)3](s) + 6NH3(aq) ——> [Cr(NH3)6]3+(aq) + 3H2O(l) + 3OH¯(aq)
  15. 2Cr3+(aq) + 3H2O2(l) + 10OH¯(aq) ——> 2CrO42-(aq) + 8H2O(l)
  16. 2 [Cr(H2O)6]3+(aq) + Zn(s) ——> 2 [Cr(H2O)6]2+(aq) + Zn2+(aq)
  17. Cr2O72-(aq) + 2OH¯(aq)⇌ 2CrO42-(aq) + H2O(l)
  18. 2 CrO42-(aq) + 2H+(aq) ⇌ Cr2O72-(aq) + H2O(l)
  19. Cr2O72-(aq) + 14H+(aq) + 6e¯ ———> 2Cr3+(aq) + 7H2O(l)
  20. MnO4¯(aq) + 8H+(aq) + 5e¯ ——> Mn2+(aq) + 4H2O(l)
  21. Fe(OH)2(s) + OH¯(aq) ——> Fe(OH)3(s) + e¯
  22. [Fe(H2O)6]3+(aq) + SCN¯(aq) ——> [Fe(SCN)(H2O)5]2+(aq) + H2O(l)
  23. AgCl(s) + 2NH3(aq) ———> [Ag(NH3)2]+(aq) + Cl¯(aq)
  24. AgBr + 2S2O32- ——> [Ag(S2O3)2]3- + Br¯

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GCE A-level Chemistry