NEET > Chemistry Class 12 > Short Tricks: How to Find Standard EMF
Short Tricks: How to Find Standard EMF Video Lecture - Chemistry Class 12 - NEET
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FAQs on Short Tricks: How to Find Standard EMF Video Lecture - Chemistry Class 12 - NEET
| 1. How can I find the standard EMF? |  |
Ans. To find the standard EMF, you can use the equation: E°cell = E°cathode - E°anode, where E°cell is the standard EMF of the cell, E°cathode is the standard reduction potential of the cathode, and E°anode is the standard reduction potential of the anode. By subtracting the anode potential from the cathode potential, you can determine the standard EMF of the cell.
| 2. What is the significance of the standard EMF? | |
Ans. The standard EMF provides information about the potential difference between the cathode and anode in a cell under standard conditions. It helps in determining the spontaneity and direction of redox reactions. The standard EMF also enables the comparison of different cells and their ability to produce electrical energy.
| 3. How are standard reduction potentials measured? | |
Ans. Standard reduction potentials are measured using a reference electrode and a half-cell. The half-cell contains the species of interest, and the reference electrode (such as a standard hydrogen electrode) has a known potential. The potential difference between the two electrodes is measured using a voltmeter, and this value is then used to determine the standard reduction potential.
| 4. Can the standard EMF be negative? | |
Ans. Yes, the standard EMF can be negative. A negative standard EMF indicates that the reaction is non-spontaneous under standard conditions. It means that the anode has a higher reduction potential than the cathode, and the reaction would not occur without an external energy source.
| 5. How does temperature affect the standard EMF? | |
Ans. Temperature can affect the standard EMF by altering the values of the standard reduction potentials. The standard reduction potentials are typically measured at a specific temperature (often 25°C). If the temperature deviates from this standard, the reduction potentials may change, leading to a different standard EMF value. Some reactions may also have temperature-dependent coefficients in the Nernst equation, which can further affect the EMF.
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