1 / 9

Electrochemistry

Electrochemistry. Kristin Shepard Brooke Petersen. Electrochemical Cells- Terms. Electrode - Any cell that is used to conduct electricity; Where the reaction actually takes place- Solid Part Anode - Solid where the oxidizing happens Cathode - Solid where the reduction occurs

udell
Download Presentation

Electrochemistry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Electrochemistry Kristin Shepard Brooke Petersen

  2. Electrochemical Cells- Terms • Electrode- Any cell that is used to conduct electricity; Where the reaction actually takes place- Solid Part • Anode- Solid where the oxidizing happens • Cathode- Solid where the reduction occurs • Current- The flow of electrons- Electricity • Salt Bridge- Concentrated salt solution with ions that will not react with solutions

  3. Standard Cell Potential • Standard Cell Potential is known as E° • There are four simple steps • Even the electrons • Flip the most negative equation • Add the equations • Add the E°

  4. Calculating ∆G° • To calculate this, we use the following equation when all substances are at standard conditions ∆G°= -nFE°

  5. Calculating K • After finding the ∆G°, we can now find K using: ∆G°= -RTlnK

  6. How many mols of Pt may be deposited on the cathode when 0.80 F of electricity is passed through a 1.0 M solution of PT4+ ? • 1.0 mol • 0.60 mol • 0.20 mol • 0.80 mol • 0.40 mol It takes 4 mol of electrons (4F) to change the platinum ions to platinum metal. The calculation would be: (0.80)(1 mol Pt/4 F)= 0.20 mol Pt.

  7. What happens to the cell voltage when the copper electrode is made smaller? • There is no change in the voltage. • The voltage becomes zero. • The voltage increases. • The voltage decreases, but stays positive. • The voltage becomes negative. The size of the electrode is not important.

  8. What happens to the cell voltage after the cell has operated for 10 minutes? • There is no change in the voltage. • The voltage becomes zero. • The voltage increases. • The voltage decreases, but stays positive. • The voltage becomes negative. As the cell operates, the copper ion concentration would decrease and the zinc ion concentration would increase. Both of these changes would make the logarithm term in the Nernst equation more negative. This would decrease the voltage.

More Related