Displacement reactions involving solutions of salts
3 marks · EasyNickel metal is added to a solution of iron(II) nitrate.
State the formula of a spectator ion in this reaction.
Explain what is meant by a spectator ion in a displacement reaction.
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Show answer
(a) NO_3^-
(b) A spectator ion is an ion that does not take part in the chemical reaction and remains unchanged on both sides of the equation.
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Marking points
A1 (a) · 1 mark · Correct formula given for spectator ion (NO3^-).
B1 (b) · 1 mark · States that a spectator ion does not take part in the reaction.
B2 (b) · 1 mark · States that it is unchanged on both sides of the equation.
Worked solution
a) The spectator ion is the nitrate ion, NO₃⁻.
b) A spectator ion is an ion that does not take part in the reaction and is unchanged (remains the same) on both sides of the equation.