Working of galvanic cell, Chemistry

Assignment Help:

Q Explain Working of Galvanic Cell?

Ans. There are several types of electrochemical cells. One type of electrochemical cell is called a galvanic cell. (A battery is a galvanic cell that is used to do work.)

In this cell, magnesium and copper are the two metal electrodes. They form a metal couple, represented by Mg/Cu. Magnesium, being more reactive than copper, gives up electrons more readily. Thus, magnesium atoms give up electrons that flow from magnesium to copper in the external circuit. When these electrons flow throw the external wire, they illuminate the light bulb.

Let's take a look at the oxidation and reduction half reactions that occur in this galvanic cell:

Magnesium gives up electrons and forms Mg2+ cations. This, this is the electrode that is the anode where oxidation takes place. This oxidation half-reaction is:
Mg ->  Mg+2 + 2e-

  • Copper receives electrons and therefore becomes the electrode that is the cathode where the reduction reaction occurs. This reduction half-reaction is:
    Cu+2 + 2e- ->
    Cu

As the blue copper ions are reduced, they are deposited on the copper metal cathode strip. Consequently, the copper sulfate solution (CuSO4) becomes less blue as the reaction proceeds. The positive sodium ions and the negative chloride ions in the salt bridge restore the charge balance in the individual beakers


Related Discussions:- Working of galvanic cell

Volume of diatomic gas, Volume of diatomic gas is less than the monatomic g...

Volume of diatomic gas is less than the monatomic gas , although diatomic gas has 2 moles ( 2 times atomes) than monoatomic gas ?? Ans) The answer is derived by avogadros law

Having similar energy in the absence magnetic field, In a multi-electron at...

In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields: (1)n=

Replacement of metals from salts, Q. How to Replace Metals from their Salts...

Q. How to Replace Metals from their Salts: Ans. If zinc is added to a solution of copper (II) sulfate, it dissolves. A reddish-brown deposit of metallic copper appears,

Periodic, lanthanide element and their electronic configuration

lanthanide element and their electronic configuration

What is standard enthalpy of formation, Q. What is Standard Enthalpy of For...

Q. What is Standard Enthalpy of Formation? Ans. It is really difficult to measure the total energy content or absolute entropy of a substance. In order to quantify entropy

Uses of benzaldehyde - aldehydes and ketones, Uses of Benzaldehyde - Aldehy...

Uses of Benzaldehyde - Aldehydes and Ketones Benzaldehyde is used, (a) In perfumery (d) In manufacture of dyes (c) In preparation of benzoic acid, cinnamic acid, cinna

The frequency corresponding to transition & hydrogen atom, The frequency co...

The frequency corresponding to transition n= 2   to n =1   in hydrogen atom is: (1) 15.66 x 10 10 Hz                           (2)  24.66 x 10 14 Hz          (3) 30.5

Explain the extraction of sulphur, Q. Explain Extraction of Sulphur? Th...

Q. Explain Extraction of Sulphur? The most important method for the extraction of sulphur from native deposits is the frasc process developed by Herman frach in 1891. It consis

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