(1) Identify each of the following half-reactions as either an oxidation half-re

ID: 580174 • Letter: #

Question

(1) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction.

(2) Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients.

The following skeletal oxidation-reduction reaction occurs under acidic conditions. Write the balanced REDUCTION half reaction.

Use standard reduction potentials to calculate the equilibrium constant for the reaction:

half-reaction identification Fe2+(aq) + 2e-Fe(s) _________oxidation/reduction Cr(s)Cr3+(aq) + 3e- _________oxidation/reduction

Ans 1 :

When there is loss of electron , oxidation is said to be taken place whereas when there is gain of electrons , reduction is said to have occurred.

Fe2+ + 2e- = Fe

Iron cation has gained two electrons to form Iron metal , so this is an reduction reaction.

Cr = Cr3+ + 3e-

Chromium metal has lost three electrons to form chromium trivalent cation , so the reaction is called as oxidation reaction.

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