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प्रश्न
Write the Nernst equation and emf of the following cell at 298 K:
\[\ce{Pt_{(s)} | Br^- (0.010 M) | Br2_{(l)} || H^+ (0.030 M) | H2_{(g)} (1 bar) | Pt_{(s)}}\]
उत्तर
The cell reaction is as follows:
\[\ce{2Br^- (0.010 M) + 2H^+ (0.030 M) -> Br2_{(l)} + H2 (1 bar)}\]
Hence, n = 2,
According to the Nernst equation for the cell, the emf is given below:
`"E"_"cell" = ("E"_("H"^+//1/2"H"_2)^Θ - "E"_(1/2"Br"_2//"Br"^-)^Θ) - 0.059/2 log_10 ("pH"_2)/(["Br"^-]^2["H"^+]^2)`
= `[0 - (+ 1.08)] - 0.059/2 log_10 1/((0.010)^2 (0.030)^2)`
= `-1.08 - 0.059/2 log_10 (1.11 xx 10^7)`
= −1.08 − 0.208
= −1.288 V
संबंधित 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]
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 the value of Ecell at 298 K for the following cell:
`(Al)/(Al^(3+)) (0.01M) || Sn^(2+) ((0.015 M))/(Sn)`
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\[\ce{{a}A + {b}B ⇔ {c}C + {d}D}\]
Nernst equation can be written as:
The cell potential for the given cell at 298 K Pt | H2 (g, 1 bar) | H+ (aq) | | Cu2+ (aq) | Cu(s) is 0.31 V. The pH of the acidic solution is found to be 3, whereas the concentration of Cu2+ is 10-x M. The value of x is ______.
[Given: (\[\ce{E_{Cu^{2+}/Cu}}\]) = 0.34 V and `(2.303 " RT")/"F"` = 0.06 V]
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.
Calculate the emf of the following cell at 298 K.
\[\ce{Cu/Cu^{2+}_{(0.025 M)}//Ag^+_{(0.005 M)}/Ag}\]
Given `"E"_("Cu"^(2+)//"Cu")^circ` = 0.34 V, `"E"_("Ag"^+//"Ag")^circ` = 0.80 V
1 Faraday = 96500 C mol -1
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:
\[\ce{Sn_{(s)} | Sn^{2+} (0.050 M) || H^+ (0.020 M) | H2_{(g)} (1 bar) | Pt_{(s)}}\]
