Standard electrode potentials, chemistry, Microeconomics

Assignment Help:

Measured cell emf are the basis for standard electrode potentials. chemistry assignments

A method for the presentation of the data obtained from measurements of the equilibrium emf of electrochemical cells must now be developed. One expects (a thermodynamic proof of this is given in the description) that varying the concentration of any reagents involved in the electrode process will affect the emf of the cell. In view of this, the emfs of the cell with the reagents at standard states are reported. In keeping with standard states introduced with these standard state conditions are again chosen to consist of gases at unit activity, implying for most gases approximately 1 bar pressure, and solutes also at unit activity. For solutes, which for electrochemical cells are frequently ions, the activities can be appreciably different from molar concentrations. How activity coefficients can be determined to recognize that a standard state is chosen and that the emf's that cells would have for their variable reagents at unit activity are tabulated.

It is impractical, however, to list the emf's of all possible combinations of electrodes. It would be much more convenient to have some means of tabulating the relative electron accepting powers of the individual electrodes. This can be done by tabulating the emf of cells composed of a selected reference electrode and a variety of other electrodes. Quite arbitrarily, it is agreed that the hydrogen electrode, with a hydrogen pressure of 1 bar and a unit hydrogen ion activity in the solution, will be used as the reference electrode.

Tabulations can then be given of the emf measured for cells with the standard hydrogen electrode on the left and another electrode on the right. For example:

Pt| H2 (1 bar)| HCl (a = 1) | Cl2 (1 bar) | Pt

The emf of this particular cell is found to be + 1.3592 V and it is this value which is given for the Pt| Cl2 |Cl-electrode.

Such tabulated values also are interpreted as electrode emf's based on a zero emf being assigned to the reference hydrogen electrode. If the value is for all reagents at unit activity, such electrode potentials are known as standard electrodes potentials, indicated by the symbol €°. The results for the hydrogen chlorine cell can now be interpreted by recalling that the reported cell emf of +1.3592 V corresponds to the process in which electrons are gained from the external circuit by the right electrode and delivered to the external circuit by the left electrode.  


Related Discussions:- Standard electrode potentials, chemistry

Introduction, What is micro static analysis?

What is micro static analysis?

Differentiate between the short and the long run, Problem 1: i) Differe...

Problem 1: i) Differentiate between the short and the long run. ii) How is production characterised the short run? Explain the fully using numerical and diagrammatic illustr

Types of restraints and validation therapy, 1. Mrs Munyarryun, 67 years, ha...

1. Mrs Munyarryun, 67 years, has been retired from her work for two years. She rings for advice about urinary incontinence, a problem she has experienced over the last 6 months. Wh

Statistics, please can you explainn what "down 0.1 percentage point on the ...

please can you explainn what "down 0.1 percentage point on the quarter means"?

Microeconomics, Consider the market for purple magic markers. The demand fo...

Consider the market for purple magic markers. The demand for purple magic markers is perfectly elastic and the supply is upward sloping. If sellers of purple magic markers are taxe

Explain about gross domestic product, Q. Explain about Gross Domestic Produ...

Q. Explain about Gross Domestic Product? Gross Domestic Product:Value of all the services and goods produced for money in an economy, evaluated at their market prices. Excludes

Cobweb model, COBWEB MODEL: Concept of dynamic stability: A market e...

COBWEB MODEL: Concept of dynamic stability: A market equilibrium is said to dynamically stable only when disequilibrium price and quantity move and over time reach to any eq

International economics., How has the haberler''s theory of opportunity cos...

How has the haberler''s theory of opportunity cost an improvement over the classical theory of trade

Find the marginal revenue, (i) When the demand function is 2Q - 24 + 3P = 0...

(i) When the demand function is 2Q - 24 + 3P = 0, find the marginal revenue when Q=3. (ii) Given the demand function 0.1Q - 10 +0.2P + 0.02P2 =0, calculate the price elasticity of

Enumeration of workers, ENUMERATION OF WORKERS: Now, let us discuss ab...

ENUMERATION OF WORKERS: Now, let us discuss about the sources of data in India on workers. In India, two main organisations which generate and compile data on workers are the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd