Displacement reactions involving solutions of salts
2 marks · HardWhen iron metal is placed in a solution of copper(II) sulfate, a reaction occurs in which copper metal forms. Write the balanced ionic equation for this displacement reaction.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)
Also accept: Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)
Common mistakes: Including spectator ions (e.g., SO_4^{2-}) in equation; Incorrect charge on ions
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Correctly writes all relevant species (Fe(s), Cu^{2+}(aq), Fe^{2+}(aq), Cu(s)) with states and charges.
A1 · 1 mark · Fully balanced ionic equation with correct direction and no spectator ions.
Worked solution
The balanced ionic equation only shows the reacting species: