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प्रश्न
Mention difficulties in settings Standard Hydrogen Electrode.
उत्तर
- It is difficult to obtain pure and dry hydrogen gas.
- The pressure of hydrogen gas cannot be maintained exactly at 1 atm throughout the measurement.
- It is also difficult to maintain the concentration of H+ ion solution at exactly 1 M. The bubbling of H2 gas into the solution results in the evaporation of water which changes the concentration of the solution.
APPEARS IN
संबंधित प्रश्न
Define Reference electrode
Answer the following in brief.
It is impossible to measure the potential of a single electrode. Comment.
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 _______.
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).
