A molecule or ion that donates a pair of electrons to a central metal ion to form a coordinate or dative covalent bond.
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What is the complex formed when copper sulphate is dissolved in water? What colour is it?
[Cu(H2O)6]2+ Pale blue
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What is formed when ammonia is added to [Cu(H2O)6]2+ ? What colour is it?
[Cu(NH3)4(H2O2)2]2+ Dark blue solution
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What kind of reaction is [Cu(H2O)6]2+ with ammonia?
ligand substitution.
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What is the reaction of [Cu(H2O)6]2+ with Cl- ions? Include colours
[Cu(H2O)6]2+ (aq) + 4Cl-(aq) ------> [CuCl4]2-(aq) + 6H2O Pale blue solution octahedral to yellow solution tetrahedral
5 of 11
What is the equation for the ligand substitution between chromium and ammonia?
[Cr(H2O)6]3+ +6NH3 ----> [Cr(NH3)6]3+ + 6H2O Violet to purple
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What are the observations when Cu2+ reacts with NaOH?
Blue solution to blue precipitate. Precipitate insoluble in excess sodium hydroxide
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What are the observations when Fe2+ reacts with NaOH?
Pale green solution to green precipitate. Precipitate insoluble in excess NaOH, but turns brown on standing as iron(II) is oxidised to iron(III).
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What are the observations when Fe3+ reacts with NaOH?
Pale yellow solution reacts to form an orange-brown ppt of iron (III) hydroxide. The precipiate is insoluble in excess NaOH.
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What are the observations when Mn2+ reacts with NaOH?
Pale pink solution reacts to form a light brown ppt which darkens in standing air. The ppt is insoluble in excess sodium hydroxide.
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What are the observations when Cr3+ reacts with NaOH?
Violet solution reacts to form a grey-green ppt. The ppt is soluble in excess in sodium hydroxide to form a dark green solution. Cr3+ --> Cr(OH)3(s) --> [Cr(OH)6]3-
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Other cards in this set
Card 2
Front
What is the complex formed when copper sulphate is dissolved in water? What colour is it?
Back
[Cu(H2O)6]2+ Pale blue
Card 3
Front
What is formed when ammonia is added to [Cu(H2O)6]2+ ? What colour is it?
Back
Card 4
Front
What kind of reaction is [Cu(H2O)6]2+ with ammonia?
Back
Card 5
Front
What is the reaction of [Cu(H2O)6]2+ with Cl- ions? Include colours
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