The reaction of ammonia with a solution containing 
ions takes
place in two steps.
Step 1: A few drops of ammonia are added
Step 2: An excess of ammonia is added to the products of Step 1.
Name the types of reaction occurring in the two steps and give the formula
of the copper complex ion in the final product.
Step 1 ...........................................................................................................................................
Step 2 ...........................................................................................................................................
Final product
Step 1: acid-base / neutralisation
Deprotonation (of complex) / protonation of ammonia
ALLOW (ionic) precipitation (1)
Step 2: Ligand and
Exchange / substitution / replacement
ALLOW
‘Ammonia substitutes for water’
(1)
Final product:
[Cu(NH3)4(H2O)2]2+
ALLOW
[Cu(NH3)4]2+
Round brackets, lack of [ ] brackets
(1)
