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प्रश्न
Can nickel displace hydrogen from hydrochloric acid?
\[\ce{E^{\circ}_{{Ni^{2+}/{Ni}}}}\] = −0.25 V
संख्यात्मक
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उत्तर
The cathode reaction is:
\[\ce{2H+ + 2e- -> H2}\]; E° = 0.00 V
The anode reaction is:
\[\ce{Ni -> Ni^2+ + 2e-}\]; E° = −0.25 V
Standard electrode potential of a cell is:
\[\ce{E{^{\circ}_{cell}} = E{^{\circ}_{cathode}} - E{^{\circ}_{anode}}}\]
= 0.00 − (−0.25)
= +0.25 V
Yes, nickel can displace hydrogen from hydrochloric acid because the cell potential is positive (+0.25 V), indicating the reaction is spontaneous.
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