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Chapter 16: Q25P (page 392)

The pathogenic bacterium Salmonella enterica uses tetrathionate found in the human gut as an oxidant- just as we useO2to metabolize our food. Write the half-reaction in which tetrathionate serves as an oxidant. Is tetrathionate as powerful an oxidant asO2?

Short Answer

Expert verified

The half reaction of tetrathionate as an oxidant is,

S4O62-+2e⇇2S2O32

Step by step solution

01

Definition of redox titration

  • Redox reactions are oxidation-reduction chemical reactions in which the oxidation states of the reactants change. The term redox refers to the reduction-oxidation process.
  • In a redox reaction, or Oxidation-Reduction process, the oxidation and reduction reactions always happen at the same time.
02

Determine the half reaction in which tetrathionate as an oxidant.

Half reaction of tetrathionate as an oxidant:

S4O62-+2e⇇2S2O32E0=0.080V

Half reaction of oxygen as an oxidant:

12O2+2H+2e-⇇H2OE0=1.23V

Values of standard reduction potential for each reaction can be found in appendix H. Since oxygen has a higher potential value it is a stronger oxidant than tetrathionate.

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Most popular questions from this chapter

Warning! The Surgeon General has determined that this problem is hazardous to your health. The oxidation numbers of CUand Biin high-temperature superconductors of the type Bi2Sr2(Ca0xYa2)Cu2Ox(which could contain Cu2+,Cu3+,Bi3+ and Bi3+) can be measured by the following procedure. In Experiment, the superconductor is dissolved in 1MHClcontaining excess 2mMCuCl2Bi5+(written as BiO3-) and Cu3+ consume Cu+ to make Cu2+:

BiO3−+2Cu++4H+→BiO++2Cu2++2H2OCu3++Cu+→2Cu2+

The excess, unreactedCu4is then titrated by coulometry (described in Chapter). In Experiment , the superconductor is dissolved in1mMFeCl2⋅4H2Ocontaining excessBi5+. reacts with therole="math" localid="1668352055227" Fe2+ butCu3+ does not react withdata-custom-editor="chemistry" Fe2+41.

role="math" localid="1668352140519" BiO3−+2Fe2++4H+→BiO++2Fe3++2H2OCu3++12H2O→Cu2++14O2+H+

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