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.

Explanation / Answer

Part A. Given equation,

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

So, Sn(s) is getting oxidized to Sn2+(aq) and Sn4+(aq) is getting reduced to Sn2+(aq.)

Eocell = Ecathode - Eanode = 0.154 - (-0.136) = 0.29 V

Part B. The net ionic equation for the determination of Fe in an ore would be,

Fe2O3(s) + Sn2+(aq) + 6H+(aq) = 2Fe2+(aq) + Sn4+(aq) + 3H2O(l)

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