Advertisements
Advertisements
प्रश्न
Calculate the e.m.f. of the following cell at 298 K:
Fe(s) | Fe2+ (0.001 M) | | H+ (0.01 M) | H2(g) (1 bar) | Pt(s)
Given that \[\ce{E^0_{cell}}\] = 0.44 V
[log 2 = 0.3010, log 3 = 0.4771, log 10 = 1]
उत्तर
According to the equation,
\[\ce{Fe(s) + 2H^+(aq) -> Fe^{2+}(aq) + H2(g)}\]
\[\ce{E^0_{cell} = E^0_{cathode} - E^0_{anode}}\]
\[\ce{E^0_{cell}}\] = 0 – (– 0.44) V
\[\ce{E^0_{cell}}\] = + 0.44 V
By applying Nernst Equation
Ecell = `E_(cell)^0 - 0.0591/2 log Q`
Ecell = `E_(cell)^0 - 0.0591/2 log ([Fe^{2+}])/[H^+]^2`
Ecell = `0.44 - (0.0591)/2 log 0.001/(0.01)^2`
Ecell = `0.44 - 0.0591/2 log 10`
Ecell = `0.44 - 0.0591/2 xx 1`
Ecell = 0.41045 V
The e.m.f. of the cell at 298 K is approximately 0.41 V.
APPEARS IN
संबंधित प्रश्न
How much charge is required for the reduction of 1 mol of Zn2+ to Zn?
Write the Nernst equation and emf of the following cell at 298 K:
\[\ce{Mg_{(s)} | Mg^{2+} (0.001 M) || Cu^{2+} (0.0001 M) | Cu_{(s)}}\]
Write the Nemst equation and explain the terms involved.
Calculate emf of the following cell at 298 K:
Mg(s) | Mg2+(0.1 M) || Cu2+ (0.01) | Cu(s)
[Given Eocell = +2.71 V, 1 F = 96500 C mol–1]
Complete the following statement by selecting the correct alternative from the choices given:
For a spontaneous reaction ΔG° and E° cell will be respectively:
What is the pH of HCl solution when the hydrogen gas electrode shows a potential of −0.59 V at standard temperature and pressure?
Calculate ΔrG0 and log Kc for the following cell:
\[\ce{Ni(s) + 2Ag^+(aq) -> Ni^{2+}(aq) + 2Ag(s)}\]
Given that \[\ce{E^0_{cell}}\] = 1.05 V, 1F = 96,500 C mol–1.
Calculate the emf of the following cell at 298 K:
Fe(s) | Fe2+ (0.01 M) | | H+ (1 M) | H2(g) (1 bar) Pt(s)
Given \[\ce{E^0_{cell}}\] = 0.44 V.
Write the Nernst equation and emf of the following cell at 298 K:
\[\ce{Fe_{(s)} | Fe^{2+} (0.001 M) || H^+ (1 M) | H2_{(g)} (1 bar) | Pt_{(s)}}\]
Write the Nernst equation and emf of the following cell at 298 K:
\[\ce{Sn_{(s)} | Sn^{2+} (0.050 M) || H^+ (0.020 M) | H2_{(g)} (1 bar) | Pt_{(s)}}\]
