Given E deg(Tl^3+/Tl+) = 1.25 V and E deg(Tl+/Tl) = -0.34 V. The standard reduction potential (in V, two decimals) of Tl^3+ + 3e- -> Tl is.

JEE Main levelNumerical answerDifficulty 2 of 3ec073

Given $E^{\circ} (Tl X^{3 +} / Tl X^{+}) = 1.25 V$ and $E^{\circ} (Tl X^{+} / Tl) = - 0.34 V$ . The standard reduction potential (in V, two decimals) of $Tl X^{3 +} + 3 e X^{-} Tl$ is.

Numerical answer type, answer in V, tolerance 0.01.

Tl X^{3 +} + 2 e X^{-} Tl X^{+}

has

Δ G^{\circ} = - 2 F (1.25)

and

Tl X^{+} + e X^{-} Tl

has

Δ G^{\circ} = - F (- 0.34)

. Adding gives

Tl X^{3 +} + 3 e X^{-} Tl

with

Δ G^{\circ} = - F (2.50 - 0.34) = - 2.16 F

. So

E^{\circ} = 2.16/3 = 0.72 V

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