3. (NH3) hydrolysis of metal aqua ions

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8 Terms

1
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instead of using a strong alkali

ammonia can be used

2
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when ammonia dissolves in water

it can accept protons from the water molecules to form NH4+ ions and OH- ligands

3
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4
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if you add excess ammonia

the H2O and OH- ligands are displaced by NH3 LIGANDS

5
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6
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Explain why the solution containing [Al(H2O)6] is acidic

  • Al3+ has a high charge density

  • Al3+ weakens O-H bonds in H2O and donates H+ to H2O to form H3O+

7
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[Al(H2O)6]3+ + 3NH3 =

[Al(H2O)3(OH)3], white ppt, +3NH4+

8
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[Al(H2O)3(OH)3] + dilute sulfuric acid=

[Al(H2O)6]3+

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