The standard reaction potential for Cu²⁺/Cu is + 0.34 V. Calculate the reduction potential at pH = 14 for the above couple. Ksp of Cu(OH)₂ is 1.0 x 10^–19.

Solution

reduction potential is given by:

$E = E ° - \frac{RT}{2 F} \ln \frac{1}{{Cu}^{2 +} / M}$
From the given data P_H =14 and K_sP (Cu(OH₂) =1.0 x 10^-19we get
H⁺ =10^-14 M thus,

[OH]^- = ${OH}^{-} = \frac{K_{w}}{[H^{+}]} = \frac{10^{- 14} M}{10^{- 14} M} = 1 M [{Cu}^{2 +}] = \frac{K_{sp}}{{OH}^{-}} = \frac{1.0 \times 10^{- 19}}{1} = 1.0 x 10^{- 19} M E = 0.34 - \frac{0.059}{2} \log \frac{1}{1.0 x 10^{- 19}} 0.34 - \frac{0.059 \times 19}{2} = 0.34 - 0.56 = - 0.22$
ans -0.22V

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Electrochemistry

The standard reaction potential for Cu²⁺/Cu is + 0.34 V. Calculate the reduction potential at pH = 14 for the above couple. Ksp of Cu(OH)₂ is 1.0 x 10^–19.

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Suggest a way to determine the Λ°_m value of water.

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Electrochemistry

The standard reaction potential for Cu2+/Cu is + 0.34 V. Calculate the reduction potential at pH = 14 for the above couple. Ksp of Cu(OH)2 is 1.0 x 10–19.

Some More Questions From Electrochemistry Chapter

Suggest a way to determine the Λ°m value of water.

The molar conductivity of 0.025 mol L–1 methanoic acid is 46.1 S cm2 mol–1. Calculate its degree of dissociation and dissociation constant. Give λ°(H+) = 349.6 S cm2 mol–1 and λ° (HCOO– ) = 54.6 s cm2 mol–1.

If the current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons flow through the wire?

Suggest a list of metals that are extracted electrolytically.

Consider the reaction: Cr2O72– + 14H+ + 6e- → 2Cr3+ + 8H2OWhat is the quantity of electricity in coulombs needed to reduce 1 mol of Cr2O72-?

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Suggest two materials other than hydrogen that can be used as fuels in fuel cells.

Name the electrolyte used in fuel cell?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

The standard reaction potential for Cu²⁺/Cu is + 0.34 V. Calculate the reduction potential at pH = 14 for the above couple. Ksp of Cu(OH)₂ is 1.0 x 10^–19.

Suggest a way to determine the Λ°_m value of water.

The molar conductivity of 0.025 mol L^–1methanoic acid is 46.1 S cm² mol^–1. Calculate its degree of dissociation and dissociation constant. Give λ°(H⁺) = 349.6 S cm²mol^–1 and λ° (HCOO^– ) = 54.6 s cm² mol^–1.

Consider the reaction: Cr₂O₇^2– + 14H⁺ + 6e- → 2Cr³⁺ + 8H₂O
What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr₂O₇^2-?