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Analytical Chemistry Lecture 3: Oxidation Potential

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Questions and Answers

According to the Nernst equation, what is the relationship between the electrode potential (E) and the molar concentration of metal ions [M+n]?

E is inversely proportional to the logarithm of [M+n]
E is directly proportional to the square root of [M+n]
E is independent of [M+n]
E is directly proportional to the logarithm of [M+n] (correct)

How does the increase in hydrogen ion concentration ([H+]) affect the oxidation potential of oxygenated systems?

The effect depends on the specific oxygenated system
Decreases the oxidation potential
Has no effect on the oxidation potential
Increases the oxidation potential (correct)

At what pH value will both iodide (I-) and bromide (Br-) ions be oxidized to their respective halogens (I2 and Br2)?

pH = 3 (correct)
pH < 3
pH = 5
pH > 3

What is the effect of adding mercuric chloride (HgCl2) to the I2/I- redox system?

It increases the ratio of [I2] / [I-], thereby increasing the electrode potential (C) Signup and view all the answers

How does the common ion effect affect the ratio of [MnO4-] / [Mn2+] in a MnSO4 solution?

It decreases the ratio, thereby decreasing the oxidation potential (A) Signup and view all the answers

What is the purpose of increasing the difference in oxidation potential between the MnO4-/Mn2+ redox couple?

To improve the endpoint detection in the titration of Mn2+ with MnO4- (B) Signup and view all the answers

What happens to the ratio [Fe3+]/[Fe2+] when F- or PO43- is added to the Fe3+/Fe2+ system?

Decrease (A) Signup and view all the answers

What effect does Ferrocyanide have on the oxidation potential of the Ferri/Ferro system?

Increase (B) Signup and view all the answers

What type of charge may a Pt electrode acquire when the system is reducing?

Negative charge (C) Signup and view all the answers

What do F ions do when added to the Fe/Fe system?

Complex with Fe2+; decrease oxidation potential (C) Signup and view all the answers

Which factor affects the oxidation potential according to the Common ion effect?

$H_2SO_4$ (C) Signup and view all the answers

What does the Zimmerman reagent contain?

$KNO_3, H_2SO_4, HCl$ (B) Signup and view all the answers

What is the relationship between an oxidizing agent and its conjugate reducing agent?

The stronger the oxidizing agent, the weaker its conjugate reducing agent, and vice versa. (A) Signup and view all the answers

When a platinum (Pt) electrode is placed in a redox system like Fe³⁺/Fe²⁺, what does a positive charge on the electrode indicate?

The system is oxidizing because it gains electrons from the Pt electrode. (A) Signup and view all the answers

What is the relationship between the oxidation potential (E) and the concentrations of the oxidized and reduced species in a redox system?

When [oxidized] = [reduced], E = E°. (D) Signup and view all the answers

What is the significance of the standard oxidation potential (E°) in a redox system?

It represents the oxidation potential when the concentrations of the oxidized and reduced species are equal. (A) Signup and view all the answers

Which statement best describes the order of oxidizing and reducing agents based on their oxidation potentials?

The most powerful oxidizing agents have the highest positive oxidation potentials, and the most powerful reducing agents have the lowest negative oxidation potentials. (A) Signup and view all the answers

What is the purpose of using a reference electrode, such as the Normal Hydrogen Electrode (NHE), in a redox system?

To measure the relative potential of the redox system against a known reference. (B) Signup and view all the answers

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