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प्रश्न
Answer the following in brief.
It is impossible to measure the potential of a single electrode. Comment.
Why it is impossible to measure the potential of a single electrode?
उत्तर
- Every oxidation reaction needs to be accompanied by a reduction reaction.
- The occurrence of only oxidation or only reduction is not possible.
- In galvanic cell oxidation and reduction occur simultaneously.
- The potential associated with the redox can be experimentally measured. For the measurement of potential two electrodes need to be combined together where the redox reaction occurs.
Hence, it is impossible to measure the potential of a single electrode.
संबंधित प्रश्न
Define Reference electrode
In construction of Standard Hydrogen Electrode, platinum acts as ______.
For hydrogen gas electrode, `"E"_("H"_2)` is calculated through to Nernst equation, where `"E"_("H"_2)^0` is always _______.
Mention difficulties in settings Standard Hydrogen Electrode.
Draw a neat and well labelled diagram of Standard Hydrogen Electrode. Also write its one application.
Calculate the potential of hydrogen electrode at 25°C:
Pt, H2 (1 atm) | H+ (0.1 M)
____________ is used as a primary reference electrode to determine the standard potentials of other electrodes.
Draw a neat, labelled diagram of a standard hydrogen electrode (SHE).
Write cell reaction and calculate the potential (EMF) of the cell Zn(s) | Zn2+(0.08 M) || Cr3+ (0.1 M) Cr(s) at 298 K.
\[\ce{E^0_{Zn} = - 0.76 V and E^0_Cr = - 0.74 V}\]
Write any two difficulties of setting SHE (Standard Hydrogen Electrode).
