Below are the available standard reduction potentials for the stannous ion, tin(

Question

Below are the available standard reduction potentials for the stannous ion, tin(II), and the stannic ion, tin(IV).

Note that 3+ is not a typical oxidation state for tin.

Part A

After the stannous chloride solution has been prepared, a few pieces of tin metal, Sn, are dropped into the bottle, to prevent oxidation by air. Determine the standard cell potential for the following reaction:

Sn(s)+Sn4+(aq)?2Sn2+(aq)

Part B

In the determination of iron in an ore, the ore (mostly Fe2O3) is first dissolved in HCl(aq). A slight excess of Sn2+ is added to reduce Fe3+ to Fe2+. Write the net ionic equation for the redox reaction.

Express your answer as a chemical equation.

Part C

The excess Sn2+ is removed by adding the mercuric ion, Hg2+(aq), forming the mercurous ion,Hg22+. Write the net ionic equation for this reaction.

Express you answer as a chemical equation.

Explanation / Answer

Part A

Sn(s)+Sn4+(aq)2Sn2+(aq)

the two half reactions are:

Sn    --> Sn+2   + 2e ( oxidation)   E = -0.136 V

Sn+4 + 2e --> Sn+2 ( reduction)   E = +0.154 V

Standard cell potential of the reaction will be

Ecell = Ereduction - E oxidation = 0.154 - (-.136) = +0.29 V

Part B

2Fe+3 + Sn+2 --> Sn+4 + 2Fe+2

PArt C:

Sn2+ + 2 Hg2+ Hg22+ + Sn4+

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