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Electrochemistry is one of the important branches of chemistry that deals with the relationship between electrical energy and chemical reactions. Electrochemistry forms the basis that is going to help students understand complex topics. In our daily lives, we often use Batteries in Smartphones and electric vehicles for their charging. This phenomenon is based on Electrochemistry. Industries depending on Electrochemistry for the refining of metals, wastewater treatment, and impurity removal. Electrochemistry notes class 12 covers a brief outline of topics such as electrochemical cells, the Nernst equation, the Gibbs energy of cell reaction, conductivity, Kohlrausch law and its applications, electrolysis, etc.
Electrochemistry Class 12 Chemistry notes will be helpful for a quick revision of topics. Chapter 2 notes are designed by our subject experts which ensures the credibility of the content provided. Class 12 Chemistry Chapter 2 notes contain all the important formulas of electrochemistry. The galvanic cell converts the chemical energy of the spontaneous reaction into electrical energy. Electrochemical principles are widely used in energy storage systems like lead-acid batteries in vehicles, fuel cells, lithium-ion batteries in smartphones, etc.
Electrochemistry is widely used in Manufacturing, Healthcare, and the protection of the environment. It becomes difficult and time-consuming for students to read NCERT book texts, point to point. So, to solve this problem, we are providing NCERT notes that cover all the topics and concepts provided in the NCERT textbook in a very clear and comprehensive way.
Also, students can refer,
NCERT Solutions for Class 12 Chemistry Chapter 3 Electrochemistry |
NCERT Exemplar Class 12 Chemistry Chapter 3 Solutions Electrochemistry |
Conductance is the measure of the ease with which current flows through a conductor.
It is defined as the conductance of a solution of 1 cm length and having 1 sq. cm as the area of cross-section.
=1
Molar conductivity is described as the conducting power produced by the ions by dissolving one mole of electrolyte in a solvent.
m = / C
m= κ×1000/M
Equivalent conductivity- Equivalent conductivity is defined as the conductivity power of combining ions formed by the dissolution of electrolyte of one gram equivalent in a solution.
e= κ×1000/Ceq
Variation of conductivity and molar conductivity with concentration-
Electrolytic conductance decreases with an increase in concentration or increases with the increase in dilution.
Molar conductivity increases with dilution.
The equation of Debye Huckel Onsager shows the variation of molar conductivity along with concentration for strong electrolytes.
m=m⁰-AC1/2
At infinite dilution when ions are completely dissociated, every ion makes its unique contribution to the molar conductivity of the electrolyte irrespective of the nature of the other ion with which it is associated.
Applications of Kohlrausch’s law-
α= c⁰
K=C(0)2(1-0)
solubility= κ×1000
Converts chemical energy of spontaneous reaction into electrical energy.
Two half cells -
Cu+2 +2e-→Cu(s) (reduction half cell)
Zn(s)→Zn2++2e- (oxidation half cell)
Overall cell reaction-
Zn(s)+ Cu+2(aq)→ Zn2+(aq)+Cu(s)
The Potential difference between two electrodes of a galvanic cell is called cell potential.
The potential difference between anode and cathode when no current is drawn through the cell.
Feasibility of a reaction-
Ecell= Eright-Eleft
Reduction Half-
Oxidation Half-
For the above reaction, the reaction is feasible if
Ecell=EAg+/Ag -ECu+2/Cu is positive.
-It is denoted by Pt(s)│H2(g)│H+(aq)
For reaction-
Mn+aq+ne-→Ms
E(Mn+│M) =EoM-RTnF ln[M(s)][Mn+(aq)]
E(Mn+│M) =EoM-2.303RTnF log[M(s)][Mn+(aq)]
E(Mn+│M) =EoM-2.303×8.314×298n×96500 log[M(s)][Mn+aq]
E(Mn+│M) =EoM-0.059nlog[M(s)][Mn+(aq)]
Here [M(s)] is taken as zero
E(Mn+│M) =EoM-0.059nlog1[Mn+(aq)]
E=E0-0.059nlog1[Mn+(aq)] at 25⁰C
For a chemical reaction-
aA+bB→cC+dD
Ecell=E0cell-RTnFlnQ
At 298K, Ecell=E⁰cell-0.059nlog[C]c[D]d/[A]a[B]b
Using the Nernst equation, the concentration of the unknown species can be found out.
At equilibrium, Nernst equation takes the form of –
E⁰cell=2.303 RTnF logK
Electrochemical cell and Gibbs Energy-
∆rG=-nFEcell
This equation can help to predict the feasibility of the reaction.
Electrolysis- The process in which chemical changes take place due to the passage of current.
Faraday’s first law of electrolysis – It says that the quantity of substance settled at the electrode is in direct proportion with the amount the electricity passed through the solution.
w α ZQ
where w is the gram of substance deposited on passing Q coulombs of electricity if a current of 1 ampere is passed for t seconds.
Faraday’s second law of electrolysis- It says that when the equal amount of electricity is passed through different solutions lined up in series, the mass of the substance settled at the electrodes is in direct proportion with the equivalent weight.
Weight of Cu deposited Weight of Ag deposited=Eq. wt. of Cu Eq. wt. of Ag
Reactions occurring at the electrode are-
Anode
Zn→Zn+2+2e-
Cathode
2NH4+(aq) + 2MnO2+2e-→Zn+2 + 2MnOOH+2NH3
Overall-
Zn+2NH4+ (aq) + 2MnO2 + Zn+2 + 2MnOOH+2NH3
-Found in electrical circuits.
-Reactions occurring at the electrodes are-
Anode-
ZnHg+2OH-→ZnOs+H2O+2e-
Cathode-
HgO(s)+ H2O+2e-→Hgl+2OH-
Overall-
ZnHg+ HgO(s)→ ZnO(s)+2OH-
-Battery used in automobiles.
-Reactions taking place at electrodes-
Anode-
Pbs+SO42-(aq)→PbSO4(s)+ 2e-
Cathode-
PbO2(s)+SO42-(aq)+ 4H+ (aq)+ 2e-→PbSO4+2H2O
Overall-
Pb+ PbO2+2H2SO4(aq)→ 2PbSO4+ 2H2O
-Has a longer life than the lead storage battery.
-Reactions occurring at electrodes-
Anode-
Cd+2OH-→CdO + H2O+2e-
Cathode−
2Ni(OH)3 + 2e-→2Ni(OH)2+2OH-(aq)
Overall-
Cd+2Ni(OH)3→CdO+2Ni(OH)2(s) + H2O(l)
Anode-
2[H2+2OH-(aq)→2H2O+2e-]
Cathode-
O2+2H2O + 4e-→4OH-(aq)
Overall-
2H2(g)+ O2→2H2O
-Deterioration of metal over time due to its reaction with air and water.
-Except gold, platinum, and palladium all other metals undergo corrosion.
Rusting of iron-
At anode-
[Fe→Fe2+(aq) + 2e-]×2
At cathode-
4H+ + O2 + 4e-→2H2O
Overall reaction-
2Fe + 4H+ + O2→2Fe+2(aq)+ 2H2O
Prevention of corrosion-
Electrochemistry Class 12 notes will help the student to revise and score good marks in the coming 12 board examination. Electrochemistry class 12 notes cover all the important topics of electrochemistry. CBSE class 12 Electrochemistry notes
are also helpful for competitive exams like VITEEE, BITSAT, JEE Main, NEET, etc. .
NCERT Class 12 Notes Chapter-Wise
NCERT Class 12 Chemistry Electrochemistry Notes |
NCERT Class 12 Chemistry Aldehydes, Ketones and Carboxylic Acid Notes |
Subject Wise NCERT Exemplar Solutions
Subject Wise NCERT Solutions
NCERT Books and Syllabus
Here are the topics covered in NCERT Class 12 chapter 3 note
In NEET, NCERT Class 12 Chemistry Chapter 3, "Electrochemistry," generally carries a moderate weightage, with approximately 4-6% of the total chemistry questions coming from this chapter
In the CBSE Class 12 Chemistry board exam, NCERT Chapter 3, "Chemical Kinetics," generally carries a weightage of 7 marks
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