Define measuring the equilibrium cell potential, Chemistry

Assignment Help:

Define Measuring the equilibrium cell potential?

Figure shows how we can use a potentiometer to determine the equilibrium cell potential. Consider Figure (a). Outside the galvanic cell is an external circuit with a battery that allows an electric current to pass through a slide wire resistor. The cell's negative terminal is connected to the negative terminal of the battery. Since the cell is not part of this circuit, no current passes through the cell, and ΦR - ΦL is the zero-current cell potential Ecell, eq. The left end of the slide wire is at the same electric potential as the left terminal of the cell.

2333_Measuring the equilibrium cell potential 1.png

In the setup shown in Figure (a), the electric potential within the slidewire is a linear function of the distance from the left end. At some position along the slide wire, the electric potential is equal to -R. We can determine this position by connecting the right terminal of the cell to a slidewire contact as shown in Fig. (b). When we place the contact at this particular position along the slidewire, there is no electric potential gradient in the connecting wire, and the galvanometer indicates a condition of zero current in the wire. It is a straightforward procedure to evaluate ΦR - ΦL from the zero-current position of the contact; this value is still equal to Ecell, eq. When we keep the slidewire contact in this position, no current passes through the cell; but if we displace the contact from this position in either direction along the slidewire, current will pass in one direction or the other through the cell. In practice, it is more convenient to measure the zero-current cell potential with a high- impedance digital voltmeter (a voltmeter that draws negligible current) instead of with a potentiometer circuit.


Related Discussions:- Define measuring the equilibrium cell potential

Oxidizing and reducing agent, ionic equation for potassium dichromate and p...

ionic equation for potassium dichromate and potassium manganate

Treshold frequency, How is threshold frequency related of the incident radi...

How is threshold frequency related of the incident radiation

Mesomeric effect, what are the differences between positive and negative me...

what are the differences between positive and negative mesomeric effect

Nomenclature of organic compounds - trivial system, Nomenclature of organic...

Nomenclature of organic compounds - Trivial System The meaning of Nomenclature is assignment of names to organic compounds. There are two major systems of nomenclature of org

Organic chemistry , factors affecting the acidity of the aromatic carboxil...

factors affecting the acidity of the aromatic carboxilic acids

The total number of unpaired electrons & atoms of element, The total numbe...

The total number of unpaired electrons in d- orbital's of atoms of element of atomic number 29 is: (1) 10         (2) 1        (3) 0     (4)5 Ans:   0

De-broglie wavelength of an electron moving with a velocity, What will be d...

What will be de-Broglie wavelength of an electron moving with a velocity of 1.2 x 10 5 ms -1 : (1)  6.068x 10 -9   (2) 3.133 x 10 -37               (3) 6.626x 10 -9

P block, electronic vinyas of led

electronic vinyas of led

Explain about neutral and amphoteric oxides, Q. Explain about Neutral and A...

Q. Explain about Neutral and Amphoteric oxides? Neutral oxides have neither acidic nor basic properties and when dissolved in water, they give neutral solutions, e.g., CO, N

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