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Building Redox Tables

Building Redox Tables. Single displacement reactions between different metals and ions can be easily carried out in labs. The results of these experiments can be used to create redox tables which allow for prediction of spontaneous reactions.

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Building Redox Tables

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  1. Building Redox Tables

  2. Single displacement reactions between different metals and ions can be easily carried out in labs. The results of these experiments can be used to create redox tables which allow for prediction of spontaneous reactions. For example when Sn2+ ions are reacted with Fe a reaction occurs. This happens because Sn2+ ions have a stronger pull on electrons than Fe atoms. This information can be built into a useful table.

  3. Redox Table Ions Metals If an ion reacts with a metal place the ion higher. If it doesn’t place it lower. Sn2+ reacts with Fe Cu Sn2+ Fe Sn2+doesn’t react with Cu. Zn2+ Zn2+ iondoes not react with Fe.

  4. Decreasing strength Decreasing strength SOA Ions Metals Fill in the missing ions and metals. Cu2+ Cu The strongest oxidizing agents are at the top of the ions column and the strongest reducing agents are at the bottom of the metals column. Sn2+ Sn Fe2+ Fe Zn2+ Zn SRA

  5. Any ion above any metal will steal the metals electrons and the reaction will be spontaneous. Cu2+ions will steal electrons from Sn, Fe, and Zn. Sn2+ ions will steal e1- from Fe and Zn. Fe2+ will react with Zn. Decreasing strength Decreasing strength SOA Ions Metals Cu2+ Cu Sn2+ Sn Fe2+ Fe Zn2+ Zn SRA

  6. Decreasing strength Decreasing strength SOA Ions Metals These half reactions can be written as reductions by adding the electrons to the equations. Cu2+ Cu + 2e1- Sn2+ Sn + 2e1- Fe2+ Fe + 2e1- Try question 9 on page 677 10-13 on page 678. Zn2+ Zn + 2e1- SRA

  7. #9 Cl2 is the most reactive, I2 is the least reactive SOA Cl2(aq) + 2e1- ---> 2Cl1-(aq) Br2(aq) + 2e1- ---> 2Br1-(aq) I2(aq) + 2e1- ---> 2I1-(aq) SRA

  8. 10. SOA + 2e1- ---> Co Co2+ Zn Zn2+ + 2e1- ---> Mg2+ + 2e1- ---> Mg SRA

  9. 2H1+ Cd 11. SOA Cu2+ + 2e1- --> Cu + 2e1- --> H2 Cd2+ Be + 2e1- --> Be2+ + 2e1- --> Ca2+ + 2e1- --> Ca SRA

  10. 12. It is empirical since experimental observations can be used to verify it. Br2(l) Ag(s) 13. Cl2(aq) Cl1-(aq) + 2e1- --> 2 + 2e1- --> 2Br1-(aq) Ag1+(aq) + 1e1- --> I2(s) + 2e1- --> 2I1-(aq) Cu2+ (aq) + 2e1- --> Cu(s)

  11. Use the Extended Redox Table on page 804 to answer questions 14-19 on page 679.

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