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Chemical Properties of Boron Family

26. The EMF o...

Question

26. The EMF of the cell Mn\vert Mn+(0.02M)\vert\vert H+(1M)\vert H2(g)(1atm), Pt at 25℃ is 0.18 V. Then the valency of the metal is, if the Standard oxidation potential of the metal is 0.76 V.

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M | M^{n +} (0.2 M) | | H^{+} (1 M) | H_{2} (g) (1 a t m)

25^{\circ} C

M | M^{n +} (0.01 M) | | H^{+} (1 M) | H_{2} (g) (1 a t m),

25^{o}

0.82

0.76

\frac{2.303 R T}{F} = 0.06

25^{o}

M | M^{n +} (0.02 M) | | H^{+} (1 M) | H_{2} (g) (1 a t m), P t

25^{o} C

0.81 V

0.76 V

log 0.02 = - 1.7

M | M^{n +} (0.02 M) | | H^{+} (1 M) | H_{2} (g) (1 atm), P t

25^{\circ} C

0.81 V

0.76 V

25^{\circ} C, Δ H_{f} (H_{2} O, I) = - 56700 J / m o l

H_{2} O (I) = 19050 J / m o l

25^{\circ} C

414 \times 10^{- x}

P t | H_{2} (g) (1 a t m) | H^{+} | | O H^{-} | O_{2} (g) (1 a t m) | P t

26^{\circ} C

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