When bar of cobalt is placed in a 1.0 M coppcr(II) nitrate solution and left to

Question

When bar of cobalt is placed in a 1.0 M coppcr(II) nitrate solution and left to stand, solid copper is seen to deposit on the cobalt bar. and some Co^2+ ions are found in solution. When equilibrium is reached in this system, essentially all of the copper ion+ have been plated out as solid copper (assuming that Cu^2 is the limiting reactant). Reactions such as this involve an explicit transfer of electrons between chemical species and are known as oxidation -reduction. or redox, reactions. A redox reaction consists of two complementary processes: the reduction of a substance that gains electrons, and the oxidation of a substance that loses electrons. Reduction and oxidation happen simultaneously so that the number of electrons gained during reduction exactly matches the number lost during oxidation A substance that is easily oxidized is one that readily gives up electrons. This electron-donating power makes the substance an effective reducing agent A substance that readily accepts electrons and is thereby reduced is an effective oxidizing agent. Co (s) + Cu2' (aq) Co2* (aq) * Cu (j) Identify the reactant that loses electrons gains electrons is oxidized is reduced is the reducing agent (0 is the oxidizing agent How many electrons are transferred when:

Explanation / Answer

Chemical equation:

Co(s) + Cu2+(aq) --> Co2+(aq) + Cu(s)

1. Identify the reactant that:

a) loses electrons
Loses electrons the reactant which passes from solid state (s) to an ionic form.
Co(s)

b) gains electrons
Gains electrons the reactant which passes from an ionic form to a solid state (s).
Cu2+(aq)

c) is oxidized
Is oxidized the specie which loses electrons in the chemical reaction.
Co(s)

d) is reduced
Is reduced the specie which gains electrons in the chemical reaction.
Cu2+(aq)

e) is the reducing agent
The reducing agent donates electrons to reduce a certain species.
The reducing agent is always the oxidized reactant.
Co(s)

e) is the oxidizing agent
The oxidizing agent accepts electrons to oxidize a certain species.
The oxidizing agent is always the reduced reactant.
Cu2+(aq)

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