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Questions and Answers
What is an electrochemical cell?
What is an electrochemical cell?
A device that generates a potential difference between electrodes by chemical reactions.
What are the two types of electrochemical cells?
What are the two types of electrochemical cells?
Galvanic cells and electrolytic cells.
What is another name for a galvanic cell?
What is another name for a galvanic cell?
Voltaic cell or Daniel cell.
What is the main component of an electrochemical cell?
What is the main component of an electrochemical cell?
How can we obtain the standard potential of a cell?
How can we obtain the standard potential of a cell?
What type of reaction is carried out in an electrolytic cell?
What type of reaction is carried out in an electrolytic cell?
Define and distinguish between molar conductivity and conductivity.
Define and distinguish between molar conductivity and conductivity.
How much charge is required for the reduction of 1 mol of Al3+ to Al?
How much charge is required for the reduction of 1 mol of Al3+ to Al?
How much electricity is necessary for the oxidation of 1 mol of H2O to O2 in coulombs?
How much electricity is necessary for the oxidation of 1 mol of H2O to O2 in coulombs?
Find the cell constant of 0.001M KCl solution with the following details: T = 208 K, conductivity = 0.146 × 10–3 S cm–1, R = 1500 Ω
Find the cell constant of 0.001M KCl solution with the following details: T = 208 K, conductivity = 0.146 × 10–3 S cm–1, R = 1500 Ω
Calculate the molar conductivity for the following: Conductivity = 0.0248 S cm–1, 0.20 M solution of KCl, Temperature = 298 K
Calculate the molar conductivity for the following: Conductivity = 0.0248 S cm–1, 0.20 M solution of KCl, Temperature = 298 K
What is a galvanic cell?
What is a galvanic cell?
What is 'EMF'?
What is 'EMF'?
What is reduction potential?
What is reduction potential?
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Study Notes
Electrochemical Cell
- A device that generates a potential difference between electrodes by chemical reactions.
- Comprises two electron conductors separated by an ionic conductor and linked by an electron conductor.
- The two metallic electrodes are dipped in the electrolytic solution.
- The ionic conductor is the important component of the cell.
Types of Electrochemical Cells
- There are two types of electrochemical cells: galvanic cells and electrolytic cells.
- Galvanic cells: convert chemical energy into electrical energy through spontaneous redox reactions.
- Also known as voltaic cells or Daniel cells.
- Electrolytic cells: use electrical energy to carry out nonspontaneous redox reactions.
EMF of a Cell
- Standard potential of the cell is obtained by taking the difference between the standard potentials of the anode and cathode.
- Electromotive force (EMF) is equal to the terminal potential difference when no current flows.
Important Concepts
- Reduction potential: the tendency of a chemical species to be reduced by gaining an electron.
- Molar conductivity: can be calculated using the formula, conductivity = 0.146 × 10–3 S cm–1.
- Cell constant: can be calculated using the formula, T = 208 K, R = 1500 Ω.
Important Questions and Answers
- Q1: What is a galvanic cell? A galvanic cell is an electrochemical cell that generates an electric current from spontaneous oxidation-reduction reactions.
- Q2: What is EMF? EMF is equal to the terminal potential difference when no current flows.
- Q3: What is reduction potential? Reduction potential is the tendency of a chemical species to be reduced by gaining an electron.
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