# Lecture26_upload - Ag voltmeter Fe Ag Fe2 1M 1M Best...

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voltmeter Ag Fe Ag+ Fe2+ ? ? ? 1M 1M

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Best oxidizing agents Best reducing agents
+ 0.799 Ag+ - 0.44 Fe2+

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voltmeter Ag Fe Ag+ Fe2+ 1.24 V Anode Cathode 1M 1M Go < 0 Fe|Fe2+(aq) || Ag+(aq)| Ag Fe + 2 Ag+ Fe2+ + 2 Ag
O2 ( g ) + 4H+ (aq) + 4e- 2H2O ( l ) 2H+ (aq) + 2e- H2 ( g ) E o = + 1.229 V E o = 0.000 V Problem: Find the constant in G o = - constant × E o knowing that G f o [H2O ( l ) ] = -237.15 kJ cell What is the charge of a single electron?

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voltmeter Zn Cu Zn2+ Cu2+ 1M 1M Anode Cathode 1.10 V
E = E o - ln Q R T nF Nernst equation 1864-1941 Walther Nernst

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Prof. Dudley Herschbach (Harvard)
Prof. Herschbach in the Simpsons…

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Inert electrode, e.g. platinum for: 2H+ (aq) + 2e- 2H2 ( g )
Example: voltmeter Zn Pt Zn2+ H+ 1M H2 ( g ) [1atm] 0.76 V Zn2+ + 2e- Zn E o= -0.76 V Cathode Anode T = 298K 1M

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voltmeter Zn Pt Zn2+ H+ 1M H2 ( g ) [1atm] 0.51 V Zn2+ + 2e- Zn E o= -0.76 V Cathode Anode T = 298K pH = ? Acidic solution of
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Lecture26_upload - Ag voltmeter Fe Ag Fe2 1M 1M Best...

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