0620/11/M/J/19/ no links please How could crystals of a pure salt be prepared from dilute
sulfuric acid?
A add an excess of aqueous sodium hydroxide, filter, evaporate
the filtrate to crystallisation point
B add an excess of copper (II) carbonate, filter, evaporate the
insoluble
filtrate to dryness
Copper sulfate.
C add an excess of copper metal, filter, evaporate the filtrate to
crystallisation point
Soluble
D add an excess of zinc oxide, filter, evaporate the filtrate to
crystallisation point
insoluble​