Explain salt bridge with its functions., Chemistry

Assignment Help:

Salt bridge is a U-shaped tube containing a semi-solid paste of some inert electrolyte like KCl, KNO3, NH4Cl, etc. in agar-agar and gelatin. An inert electrolyte is one which:

(a) Does not react chemically with the solutions in either of the component.

(b) Does not interface with the net cell reaction.

Function of the salt bridge

In the electrochemical cell a salt bridge serves two very important functions:

(i) It allows the flow of current by completing the circuit 

(ii)
 It maintains electrical neutrality.

The transference of electrons from anode to cathode leads to net positive charge around the anode due to increase in the concentration of cations and net negative charge around the cathode due to excess of anions in solutions. The positive charge around the anode will prevent electrons to flow out from it and the negative charge around the cathode will prevent the inflow of electrons at it. The reaction would then, stop, and no current will flow. The salt bridge comes to aid and restores the electrneutrality of the solutions in the two compartments. It contains concentrated solutions of an inert electrolyte the ions of which are not involved in electrochemical reactions. The anions of the electrolyte in the salt bridge migrate to the anode compartment and cations to the cathode compartment. Therefore, the salt bridge prevents the buildup of charges and preserves the flow of current. In the electrochemical cell, the salt bridge can be replaced by the porous partition which allows the migration of ions but does not allow mixing of the two solutions.

 

 


Related Discussions:- Explain salt bridge with its functions.

Ammonical smell, how can we identify the ammonical smell and punjent smell?...

how can we identify the ammonical smell and punjent smell?

Salt, . Types of salt and what happens when expose to the atmosphere

. Types of salt and what happens when expose to the atmosphere

Operation of tar, Write a program called tarc that performs much of the cf ...

Write a program called tarc that performs much of the cf operation of tar .The command arguments look like: If there are no ar guments, tarc reports an error and e xits. If ther

Show anomalous behaviour of oxygen, Q. Show Anomalous Behaviour of Oxygen? ...

Q. Show Anomalous Behaviour of Oxygen? Oxygen differs considerably from the rest of the family members. Small size, very high electronegativity and non-availability of d-orbita

Carbon valency, how carbon tetra-valency lead to stability?

how carbon tetra-valency lead to stability?

Show the broader classification, Q. Show the broader classification? A ...

Q. Show the broader classification? A broader classification is based on the reaction of the oxide with water. According to this, oxides are classified as' acidic, basic, neutr

Nuclear chemistry, Stability of a nucleus and its binding energy

Stability of a nucleus and its binding energy

Explain reaction for benzyl chloride to benzyl alcohol, How are the followi...

How are the following conversions carried out? (i)  Benzyl chloride to benzyl alcohol, (ii)  Methyl magnesium bromide to 2- methlpropan -2-ol,

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