Explain nerst equation., Chemistry

The tendency to metal to lose electrons or tendency of its ions to gain electrons depends upon the concentration of the ions in solution. At the same time, the tendency to lose or gain electrons is expressed in terms of electrode potentials. The value of electrode potential, thus, varies with the variation in the concentration of the ions. The quantitative relationship between the concentration of ions and electrode potentials is given by Nerst equation. For a common electrode reaction:


Mn+ + ne-  2085_nerst equation.png  M

The nerst equation can be written in the two ways as

1027_nerst equation1.png  + (RT/nF) In [Mn+]/[M]

Or, 1027_nerst equation1.png - (RT/nF) In [Mn+]/[M]


In the present aspect, only the first form will be used in the further discussion. Converting natural logarithm (In) to log10 in the first expression, we get

1027_nerst equation1.png  + (2.303 RT/nF) log [Mn+]/[M],

Where, 1872_nerst equation2.png = electrode potential


714_electrochemical3.png  = standard electrode potential with reference to SHE when concentration of Mn+ is 1 mol L-1

R = 8.314 JK-1 mol-1;

T = temperature

[Mn+] = molar concentration of ions;

n = number of electrons gained

F = Faraday constant 96500 C mol-1;

[M] = concentration of metal

Substituting these values, we get

632_nerst equation3.png  log [Mn+]/[M]

1868_electrochemical3.png =  + (0.059/n) log [Mn+]/[M]

In general, for any electrode,

Ered = 2015_nerst equation4.png + (0.059/n) log [oxidized state]/[reduced state]

 

 

 

 

 

 

 

 

 

Posted Date: 6/26/2012 1:59:03 AM | Location : United States







Related Discussions:- Explain nerst equation., Assignment Help, Ask Question on Explain nerst equation., Get Answer, Expert's Help, Explain nerst equation. Discussions

Write discussion on Explain nerst equation.
Your posts are moderated
Related Questions
Free radical replacement reactions Free radical substitution reactions include the attack by a free radical. These reactions happen by free radical mechanism that includes Init

what is the advantag of reversible reaction?

Q. How do you determine the oxidizing or reducing agent? Ans. A substance that oxidizes another substance is called an oxidizing agent. One that reduces another substance

Iodometric Titrations and Iodimetric The reduction of free iodine to iodide ions and oxidation of iodide ions to free iodine takes place in these titrations. I 2 + 2e - →

kinds of reactions benzene undergoes and why

Find the number of intensive variables? Consider the lime-kiln process CaCO 3 (s) → CaO (s) + CO 2 (g) Find the number of intensive variables that can be varied independen

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is: (1) 17              (2) 37        (3)2              (4)38 Ans: 17

#question.What is the balanced equation for the reaction of aluminium nitrate solution and sodium carbonate solution; where aluminium hydroxide is formed.


The nucleus of an element contains 9 protons. Its valency would be : (1) 1        (2) 3        (3) 2        (4) 5 Ans: 1