IGCSE Chemistry 0620/21/O/N/21 Q19


19 Copper(II) chloride crystals are made by adding solid copper(II) carbonate to dilute
hydrochloric acid until no more dissolves.

Which process is used to obtain pure copper(II) chloride crystals from the mixture?

A distillation of the mixture
B evaporation of the mixture
C filtration followed by drying of the residue
D filtration followed by evaporation of the filtrate

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Answer ( 1 )


    Reacting solid copper (II) carbonate + dilute hydrochloric acid

    CuCO3 + 2HCl –> CuCl2 + H2O + CO2

    CuCl2 is a soluble salt.

    Filtration is needed to separate the excess solid copper (II) carbonate. Evaporation is needed to gain CuCl2 crystals from its solution.

    Ans: D

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