E0red of an element cab be calculated by comparing it with _____________________?
Correct answer: B. SHE
- A. New electrode of same element
- B. SHE
- C. 1M solution of ions of respective element
- D. 2M solution of HCI
Explanation
A standard reduction potential is measured by connecting the half-cell to the standard hydrogen electrode, whose potential is defined as 0 V. Under standard conditions, the cell potential then gives the half-cell's reduction potential relative to SHE. The likely mistake is choosing a 1 M solution of the element's ions, because concentration alone does not provide a reference electrode potential.
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About Standard Hydrogen Electrode
The standard hydrogen electrode provides the reference potential of 0.00 V for measuring electrode potentials. It consists of platinum in contact with hydrogen gas at standard pressure and hydrogen ions at standard concentration, usually at 25°C, and can operate as either the oxidation or reduction half-cell.
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