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Redox reactionsReduction – oxidation reaction
Electron transfer occurs
Reactant 1Reactant
2
e-
Undergoes oxidation
Undergoes reduction
This
is a
Rix
-Tab
le (o
r a
RED
OX
tabl
e)It helps you to write the oxidation and reduction half reactions.
The reaction between Zinc and Copper (II) sulphate
Zn atoms (atoms are always electrically neutral) loses two electrons, becoming positively charged
Zn-ions.
Zn Zn2+ + 2e-
Oxidation: electrons lost
Copper(II)sulphate consist of copper ions and sulfate ions. Electrons from the Zn-atoms are
transferred to the copper ions. The copper ions gain the electrons and copper atoms forms. They
combine to form a copper precipitate in the solution.
Cu2+ + 2e- Cu
Reduction: electrons gained
The sulphate ions are spectator ions.
Spectator ions are present in a reaction, without experiencing oxidation or reduction.
Slide 4: http://images.flatworldknowledge.com/averillfwk/averillfwk-fig19_002.jpg
A. Olivier; Physical Sciences Book 2 Chemistry 2nd edition 2013