Metal-Aqua Ions and Bases (dropwise)

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1. What forms from [Cr(H2O)6]3+ with a base added dropwise?

  • Cr(H2O)3(OH)3 (Green precipitate)
  • Cr(H2O)3(OH)3 (Violet precipitate)
  • Cr(H2O)4(OH)2 (Violet precipitate)
  • Cr(H2O)4(OH)2 (Green precipitate)
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2. What forms from [Fe(H2O)6]2+ with a base added dropwise?

  • Fe(H2O)4(OH)2 (Green precipitate)
  • Fe(H2O)3(OH)3 (Green precipitate)
  • Fe(H2O)4(OH)2 (Brown precipitate)
  • Fe(H2O)3(OH)3 (Brown precipitate)

3. What forms from [Co(H2O)6]2+ with a base added dropwise?

  • Co(H2O)3(OH)3 (Blue-green precipitate)
  • Co(H2O)4(OH)2 (Blue-green precipitate)
  • Co(H2O)4(OH)2 (Blue precipitate)
  • Co(H2O)4(OH)2 (Blue solution)

4. What forms from [Al(H2O)6]3+ with a base added dropwise?

  • A(OH)6 (White precipitate)
  • Al(H2O)3(OH)3 (White precipitate)
  • Al(H2O)4(OH)2 (White precipitate)
  • Al(H2O)2(OH)4 (White precipitate)

5. What forms from [Cu(H2O)6]2+ with a base added dropwise?

  • Cu(H2O)3(OH)3 (Blue precipitate)
  • Cu(H2O)3(OH)3 (Green precipitate)
  • Cu(H2O)4(OH)2 (Blue precipitate)
  • Cu(H2O)4(OH)2 (Green precipitate)

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