Electrode Potentials, AQA, A2
- Created by: VerySexySnake
- Created on: 02-05-16 13:06
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- Electrode Potentials
- Calculating E Cell
- Cell diagram
- ECELL = Erighths - Elefths
- Pt/H2/H+ cell
- Used as a standard
- Electrochem series
- Most positive - least positive
- E.G.
- CL2 + 2e=2Cl-
- +136V
- Most positive - least positive
- -0.76V
- 1.36-(-0.76)
- =2.12
- Most positive - least positive
- +136V
- Zn2+ + 2e=ZN
- -0.76V
- CL2 + 2e=2Cl-
- If Ecell is positive, reaction is feasible.
- =2.12
- Cell diagram
- Cell Diagrams
- Pt/Fe2+,Fe3+ :: Ag1+/Ag
- / = Change in state
- :: = salt bridge
- Ecell= Erhs-Elhs
- Right side is most positive
- Pt/Fe2+,Fe3+ :: Ag1+/Ag
- Cells
- Pt electrode
- Good solid conductor
- Is inert
- High resistance voltmeter
- used to stop current
- To measure highest pH
- Standard coditions
- 1M solutions
- 298K / 25'c
- Standard pressure 100 KPA
- Salt bridge- KNO3
- Completes circuit, allows ions to diffuse
- Pt electrode
- Reducing / Oxidising agents
- Best Reducing agent = Zn
- best at gaining electrons (most - Ecell)
- Best Oxidising agent = F2
- Bst at loosing electrons (most + Ecell)
- OIL RIG
- Best Reducing agent = Zn
- Calculating E Cell
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