Question

Balance the following half-reactions in acidic solution, identify the oxidation states of the metal atoms, and...

Balance the following half-reactions in acidic solution, identify the oxidation states of the metal atoms, and use the predominance diagrams to determine the standard reduction potentials.

ReO4 - → ReO3

HSeO4 - → H2SeO3

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Answer #1

a)ReO4 -ReO3

In ReO4, Re is in +7 oxidation state

In ReO3, Re is in +6 oxidation state

This is reduction half cell

Balence oxygen with water

ReO4 -ReO3 + H2O

Balence hydrogen with H+

ReO4 - + 2H+ ReO3 + H2O

Balence electron

ReO4 - + 2H+ +1e-    ReO3 + H2O (1)

(b)HSeO4 -H2SeO3

HSeO4 -, Se in +6 oxidtion state

H2SeO3, Se in +4 oidation state

reduction

SeO4 2-SeO32-

SeO4 2-SeO32- + H2O

2H+ + SeO4 2-SeO32- + H2O

2H+ + 2e- + SeO4 2-SeO32- + H2O (2)

Hence balenced equation

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Answer #1

a)ReO4 -ReO3

In ReO4, Re is in +7 oxidation state

In ReO3, Re is in +6 oxidation state

This is reduction half cell

Balence oxygen with water

ReO4 -ReO3 + H2O

Balence hydrogen with H+

ReO4 - + 2H+ ReO3 + H2O

Balence electron

ReO4 - + 2H+ +1e-    ReO3 + H2O (1)

(b)HSeO4 -H2SeO3

HSeO4 -, Se in +6 oxidtion state

H2SeO3, Se in +4 oidation state

reduction

SeO4 2-SeO32-

SeO4 2-SeO32- + H2O

2H+ + SeO4 2-SeO32- + H2O

2H+ + 2e- + SeO4 2-SeO32- + H2O (2)

Hence balenced equation

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