Electrochemical thermodynamics, Chemistry

ELECTROCHEMICAL THERMODYNAMICS

Notation:

To avoid repetitive drawing of complicated cells diagram, a common notation has been adopted for cells. All electrical contacts between half-cells are assumed changes of phase are denoted by |, a salt bridge is shown as || and a junction between two different solutions (a liquid junction in a glass frit) by. If there are multiple species in the same phase these are separated by commas (,). The cell is shown starting at the left-hand electrode and moving to the right-hand electrode through the solution. Examples of cells under standard conditions are:

Pt|H2(g, p=1 atm)|H+(aq, a=1)||Cl-(aq, a=1)|AgCl(s)|Ag(s)

 

Pt|Fe3+(aq, a=1), Fe2+(aq, a=1)||Zn2+(aq, a=1)|Zn(s)

 

Formal cell reaction:

The overall formal cell reaction is obtained by writing both half-cell reactions as reductions, e.g.

 

1824_formal cell reaction.png

The number of electrons in each equation is then made equal (if necessary):

 

2068_formal cell reaction1.png

As with the half-cell potentials, the LH reaction is subtracted from the RH to give the formal cell reaction. Minus the LH reaction is equivalent to reversing the reaction (writing it as an oxidation):

 

299_formal cell reaction2.png

which is followed by combining species on the same side of the reaction arrows together and cancelling those which appear on both sides to give:

 

1617_formal cell reaction3.png

which is the formal cell reaction.

Posted Date: 7/20/2012 4:36:48 AM | Location : United States







Related Discussions:- Electrochemical thermodynamics, Assignment Help, Ask Question on Electrochemical thermodynamics, Get Answer, Expert's Help, Electrochemical thermodynamics Discussions

Write discussion on Electrochemical thermodynamics
Your posts are moderated
Related Questions
crystal field theory

how it works, give me some examples

THE VOLUMETRIC DETERMINATION OF A GIVEN ACETIC ACID SOLUTION REQUIRED BY USING 100 ML. OF A STANDARD CAUSTIC SODA SOLUTION. Compound Microscope 1. Procedure for st

laws of chemical combinations

What can you do to make Triethanolamine stearate less soluble in lipids?

why f-block elements are called inner transition elements?

RNA nucleotides Base + Ribose → (Nucleoside) + Phosphoric acid → Nucleotide

What do you understand by Miller indices of a crystal plane? Miller Indices are a symbolic vector representation for the orientation of an atomic plane in a crystal lattice an


Uses of Perfluorocarbons Perfluorocarbons are good electrical insulators. These have several important uses like: (a) Perfluorocarbons are used as surface coatings, lubrican