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Electrochemistry

Short Answer Type

1. How would you determine the standard electrode potential of the system Mg²⁺/Mg?

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2. Can you store copper sulphate solutions in a Zinc pot?

1384 Views

3. Consult the table of standard electrode potentials and suggest three substance that can oxidize ferrous ions under suitable conditions.

879 Views

4. Calculate the potential of hydrogen electrode in contact with a solution whose pH is 10.

Answer:

For hydrogen electrode, ,

given that pH = 10

use formula [H⁺] = 10^–pH

so that [H⁺] = 10⁻¹⁰ M

Electrode reaction will

H⁺ + e^– →1/2 H₂

Use the formula

E_{H^{+} / H_{2}} = {E^{o}}_{H}^{+} / H_{2} - \frac{RT}{nF} \ln \frac{[H_{2}]}{[H^{+}]^{2}} = 0 - \frac{8.314 \times 298}{2 \times 96500} \ln \frac{[I]}{{[H^{+}]}^{2}} = 0.05915 \log [H^{+}] = - 0.05915 pH = - 0.05915 \times 10 = - 0.59 V

1279 Views

Long Answer Type

5. Calculate the emf of the cell in which the following reaction takes place:
Ni(s) + 2Ag⁺ (0.002 M)

\to

Ni²⁺ (0.160 M) + 2Ag(s)
Given that

{E^{o}}_{Cell} = 1.05 V

1585 Views

6. The cell in which the following reaction occurs:
2Fe³⁺ (aq) + 2I^–(aq)

\to

2Fe²⁺ (aq) + I₂(s) has E⁰_cell = 0.236 V at 298 K. Calculate the standerd Gibbs energy and the equilibrium constance of the cell reaction.

919 Views

Short Answer Type

7. Why does the conductivity of a solution decrease with dilution?

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

175 Views

Long Answer Type

9. 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.

225 Views

Short Answer Type

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

198 Views