Q8.
Which substance has delocalised electrons?
(Total 1 mark)
Q9.
Solution A contains the compound [Cu(H2O)6]Cl2
(a) State the type of bonding between the oxygen and hydrogen in this compound.
(1)
(b) State why the chloride ions in this compound are not considered to be ligands.
(1)
(c) An excess of ammonia was added to a sample of solution A to form solution B.
Write an ionic equation for the reaction that occurs when solution A is converted into solution B and state the colour of solution B.
(2)
(d) Aqueous sodium carbonate was added to another sample of solution A to form a blue-green solid C.
Identify the blue-green solid C.
(1)
(e) Reagent D was added to another sample of solution A to form a yellow-green solution.
Identify reagent D and write an ionic equation for the reaction that occurs when the yellow-green solution is formed from solution A.
(2)
(f) Explain why colorimetry cannot be used to determine the concentration of solutions containing [CuCl2]−
In your answer refer to the electron configuration of the metal ion.
(2)
(Total 9 marks)