Reactions of metal-aqua ions

ashiana121
Flashcards by ashiana121, updated more than 1 year ago
ashiana121
Created by ashiana121 about 5 years ago
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A-Level A2 CHEMISTRY Flashcards on Reactions of metal-aqua ions, created by ashiana121 on 01/29/2016.

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Question Answer
What are the 5 transition metals we study that form metal aqua ions? Co Cu Fe Al Cr Fe
Which are 2+? Co Cu Fe
Which are 3+? Al Cr Fe
How many water ligands are attached to each of the central metal ions? 6
What are the 3 reagents we need to remember the reaction colours of? Na₂CO₃ OH¯ NH₃
What colour is the [Cu(H₂O)₆]²⁺ ion? Blue
What colour is the [Cr(H₂O)₆]³⁺ ion? Ruby
What colour is the [Al(H₂O)₆]³⁺ ion? Colourless
What colour is the [Co(H₂O)₆]²⁺ ion? Pink
What colour is the [Fe(H₂O)₆]³⁺ ion? Violet
What colour is the [Fe(H₂O)₆] ²⁺ ion? Green
When the [Fe(H₂O)₆] ²⁺ ion is reacted with OH¯ or NH₃, what is formed? (Formula and physical appearance) Green precipitate Fe(H₂O)₄(OH)₂
If the same ion ([Fe(H₂O)₆] ²⁺) is reacted with Na₂CO₃ the physical appearance is the same however the formula of the precipitate is different. What is this formula? FeCO₃
The [Fe(H₂O)₆]²⁺ reactions are different to the [Fe(H₂O)₆]³⁺ reactions. What colour precipitate is formed in all the reactions of the ³⁺ ion? (with Na₂CO₃, OH¯ and NH₃) Brown
How many moles of [Fe(H₂O)₃(OH)₃] are made in the reactions of [Fe(H₂O)₆]³⁺ with OH- or NH₃? 1
How many are made in the reaction with Na₂CO₃? 2
What colour precipitate is made when [Co(H₂O)₆]²⁺ is reacted with Na₂CO₃? Pink
What is the formula of this precipitate? CoCO₃
The same colour precipitate is formed when [Co(H₂O)₆]²⁺ is reacted with dilute ammonia and with OH-. What colour is this precipitate? Blue-green
Is the formula of the precipitate the same? Yes
What is the formula? Co(H₂O)₄(OH)₂
What colour solution is formed when [Co(H₂O)₆]²⁺ reacts with excess ammonia? Straw
What is the formula of the complex ion which makes this solution appear straw coloured? [Co(NH₃)₆]²⁺
The [Al(H₂O)₆]³⁺ ion is colourless. In what reaction (with ammonia/hydroxide, excess ammonia, excess hydroxide or sodium carbonate) does the solution remain colourless? Excess hydroxide
What is the formula of the ion formed in this reaction? [Al(OH)₄]¯
The same colour precipitate is formed in the three other reactions. What colour is this? White
For the reactions with ammonia/hydroxide, excess ammonia, and sodium carbonate the same white precipitate is made. What is the formula of this? Al(H₂O)₃(OH)₃
What is the only difference between the reactions of hydroxide/ammonia and the reaction of sodium carbonate? Reaction with sodium carbonate - 2 moles of Al(H₂O)₃(OH)₃ formed
What colour is the [Cr(H₂O)₆]³⁺ ion? Ruby
When it is reacted with excess ammonia, what colour does the solution go and what is the formula of the ion responsible for the appearance of this colour? Purple [Cr(NH₃)₆]³⁺
Out of the reactions of [Cr(H₂O)₆]³⁺ with - hydroxide/ammonia -excess hydroxide -sodium carbonate Which forms a green precipitate and which forms a green solution? [Cr(H₂O)₆]³⁺ and hydroxide/ammonia = green precipitate [Cr(H₂O)₆]³⁺ and excess hydroxide = green solution [Cr(H₂O)₆]³⁺ and sodium carbonate = green solution
What is the formula of the green precipitate? Cr(H₂O)₃(OH)₃ 2[Cr(H₂O)₃(OH)₃] for reaction with Na₂CO₃
What is the formula of the green solution formed when the [Cr(H₂O)₆]³⁺ reacts with an excess of hydroxide? [Cr(H₂O)₆]³¯
The [Cu(H₂O)₆]²⁺ ion is ____ Blue
When the [Cu(H₂O)₆]²⁺ ion reacts with hydroxide or ammonia (not in excess) or with an excess of hydroxide, a ____ __________ is formed Blue precipitate
What is the formula of this precipitate? Cu(H₂O)₄(OH)₂
A deep blue solution is formed when [Cu(H₂O)₆]²⁺ reacts with... Excess NH₃
What is the charge of the complex ion that makes this solution appear deep blue? 2+
What is the formula of this complex ion? [Cu(NH₃)₄(H₂O)₂]²⁺
What is happens when the [Cu(H₂O)₆]²⁺ ion reacts with sodium carbonate? CuCO₃, a green-blue precipitate is formed
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