Complex ions acting as acids

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10 Terms

1
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[Fe(H2O)6]+2 + NaOH

Dropwise

Reaction, Reaction Type, Observation

  • [Fe(H2O)6]+2 + OH- → Fe(H2O)4(OH)2 + 2H2O

  • Hydrolysis

  • Green-brown Precipitate


2
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[Fe(H2O)6]+2 + NaOH

Excess

Reaction, Observation

  • No further reaction

  • Darkens over time due to oxidation to Fe(H2O)3(OH)3


3
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[Cu(H2O)6]2+ + NaOH

Dropwise

Reaction, Reaction type, Observation

  • [Cu(H2O)6]2+ + OH- → Cu(H2O)4(OH)2 + 2H2O

  • Hydrolysis

  • Blue precipitate


4
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[Cu(H2O)6]2+ + NaOH

In excess

Reaction,Observation

  • No further reaction

  • No further observation


5
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[Fe(H2O)6]+3+ NaOH

Dropwise

Reaction, Reaction Type, Observation

  • [Fe(H2O)6]+3+ 3OH- →Fe(H2O)3(OH)3 + 3H2O

  • Hydrolysis

  • Dark brown ppt


6
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[Fe(H2O)6]+3+ NaOH

In excess

Reaction,Observation

  • No further reaction

  • No further observation


7
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[Al(H2O)6]3+ + NaOH

Dropwise

Reaction, Reaction type, Observation

  • [Al(H2O)6]3+ + 3OH- → Al(H2O)3(OH)3 +3H2O

  • Hydrolysis

  • White ppt is formed


8
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[Al(H2O)6]3+ + NaOH

In excess

Reaction, Reaction type, Observation

  • Al(H2O)3(OH)3 + OH- → [Al(H2O)2(OH)4]- + H2O

  • Hydrolysis

  • white ppt is redissolved


9
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Which has the greater acidity [M(H2O)6]2+ or [M(H2O)6]3+

  • [M(H2O)6]3+ has the greater acidity

  • Electron pairs are being pulled away form the oxygen towards the central ion more strongly

  • The electron pairs in the OH bond are pulled even closer to the oxygen

  • Hydrogen is made even more positive

  • Therefore Hydrogen ion is more likely to be lost


10
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When the metal ions are acting as an acid which reaction do they undergo

Hydrolysis