Electrochemistry

Question 1

State the Nernst equation and define each term.

Question 2

Discuss the mode of operation of the fluoride ion selective electrode.

Question 3

Give details of how Cu²⁺, Zn²⁺, Cd²⁺ and Pb²⁺ can be determined simultaneously using the technique of anodic stripping voltammetry (ASV).

Question 4

Give details of two reference electrodes used in routine electrochemical measurements.

Question 5

What is the purpose of the following electrodes:
- Working electrode
- Reference electrode
- Auxiliary electrode

Question 6

What is a galvanic cell?

Question 7

What is an electrolytic cell?

Question 8

Give an example of a galvanic cell.

Question 9

Give an example of an electrolytic cell.

Question 10

Explain how the blood glucose monitor determines the concentration of glucose in a blood sample.

Question 11

Explain the principle of how the concentration of a redox-active substance is determined using the voltametric measurement system.

Question 11

For the reaction: Cu²⁺ + Zn → Cu + Zn²⁺, state which species is oxidised and which is reduced.

Question 12

Give the half-cell reactions for the redox reaction: Cu²⁺ + Zn → Cu + Zn²⁺.

Question 13

Define oxidation in organic reactions.

Answer 13

Oxidation is the loss of protons in organic reactions.

Question 14

Define reduction in organic reactions.

Answer 14

Reduction is the gain of protons in organic reactions.

Question 15

State the measured parameter and the fixed parameters in:
- potentiometry
- voltammetry
- amperometry

Question 16

Define reduction in inorganic reactions.

Answer 16

Reduction is the gain of electrons in inorganic reactions.

Question 17

Define oxidation in inorganic reactions.

Answer 17

Oxidation is the loss of electrons in inorganic reactions.

Question 18

Give an example of a forensically significant conductance measurement and

Question 19

Give an example of a pharmaceutically significant conductance measurement, and indicate the conductivity of this sample.

Question 19

Give an example of a pharmaceutically significant conductance measurement, and indicate the conductivity of this sample.

Question 20

Explain how conductance measurements are obtained.

Question 21

Explain what the conductance probe is
actually measuring.

Question 22

Write the two half-reactions associated with this equation.
5Fe²⁺ + MnO₄⁻ + 8H⁺→ 5Fe³⁺ + Mn²⁺ + 4H₂O