CMY3705 ASSIGNMENT 1 [COMPLETE ANSWERS SEMESTER 2 2024
1. Introduction to Analytical Chemistry
Question: What are the main steps involved in the analytical process?
Answer: The main steps in the analytical process include:
1. Defining the problem.
2. Selecting the appropriate analytical method.
3. Sampling.
4. Sample preparation.
5. Analysis.
6. Data interpretation.
7. Reporting results.
8. Drawing conclusions.
2. Chemical Equilibria
Question: How is the equilibrium constant (K) expressed for the reaction aA+bB⇌cC+dDaA +
bB \rightleftharpoons cC + dDaA+bB⇌cC+dD?
Answer: The equilibrium constant KKK for the reaction aA+bB⇌cC+dDaA + bB \
rightleftharpoons cC + dDaA+bB⇌cC+dD is expressed as: K=[C]c[D]d[A]a[B]bK = \frac{[C]^c
[D]^d}{[A]^a [B]^b}K=[A]a[B]b[C]c[D]d
3. Acid-Base Titrations
Question: Explain the difference between a strong acid-strong base titration and a weak acid-
strong base titration.
Answer: In a strong acid-strong base titration, both the acid and base completely dissociate in
water, leading to a sharp and clear equivalence point, typically at pH 7. In a weak acid-strong
base titration, the weak acid does not fully dissociate, resulting in a more gradual change in pH
around the equivalence point, which will be higher than pH 7 due to the formation of the
conjugate base.
4. Redox Reactions and Electrochemistry
Question: Describe how a galvanic cell operates.
Answer: A galvanic cell operates by converting chemical energy into electrical energy through
redox reactions. It consists of two half-cells, each containing an electrode and an electrolyte. The
oxidation reaction occurs at the anode, releasing electrons, while the reduction reaction occurs at
the cathode, consuming electrons. The electrons flow through an external circuit from the anode
to the cathode, generating an electric current. The salt bridge or porous membrane maintains
electrical neutrality by allowing ion flow between the half-cells.
5. Spectroscopy
1. Introduction to Analytical Chemistry
Question: What are the main steps involved in the analytical process?
Answer: The main steps in the analytical process include:
1. Defining the problem.
2. Selecting the appropriate analytical method.
3. Sampling.
4. Sample preparation.
5. Analysis.
6. Data interpretation.
7. Reporting results.
8. Drawing conclusions.
2. Chemical Equilibria
Question: How is the equilibrium constant (K) expressed for the reaction aA+bB⇌cC+dDaA +
bB \rightleftharpoons cC + dDaA+bB⇌cC+dD?
Answer: The equilibrium constant KKK for the reaction aA+bB⇌cC+dDaA + bB \
rightleftharpoons cC + dDaA+bB⇌cC+dD is expressed as: K=[C]c[D]d[A]a[B]bK = \frac{[C]^c
[D]^d}{[A]^a [B]^b}K=[A]a[B]b[C]c[D]d
3. Acid-Base Titrations
Question: Explain the difference between a strong acid-strong base titration and a weak acid-
strong base titration.
Answer: In a strong acid-strong base titration, both the acid and base completely dissociate in
water, leading to a sharp and clear equivalence point, typically at pH 7. In a weak acid-strong
base titration, the weak acid does not fully dissociate, resulting in a more gradual change in pH
around the equivalence point, which will be higher than pH 7 due to the formation of the
conjugate base.
4. Redox Reactions and Electrochemistry
Question: Describe how a galvanic cell operates.
Answer: A galvanic cell operates by converting chemical energy into electrical energy through
redox reactions. It consists of two half-cells, each containing an electrode and an electrolyte. The
oxidation reaction occurs at the anode, releasing electrons, while the reduction reaction occurs at
the cathode, consuming electrons. The electrons flow through an external circuit from the anode
to the cathode, generating an electric current. The salt bridge or porous membrane maintains
electrical neutrality by allowing ion flow between the half-cells.
5. Spectroscopy
