Ch.21 - Transition Elements and Coordination Chemistry

McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook

McMurry 8th Edition

Ch.21 - Transition Elements and Coordination Chemistry

Problem 21.47

Chapter 21, Problem 21.47

What is the general trend in standard potentials for the oxidation of first-series transition metals from Sc to Zn? What is the reason for the trend?

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Identify the first-series transition metals, which range from Scandium (Sc) to Zinc (Zn) in the periodic table.

Understand that standard reduction potentials are used to determine the tendency of a species to be reduced; the more positive the potential, the greater the species' tendency to gain electrons.

Recognize that the standard oxidation potential is the negative of the standard reduction potential. Therefore, a more negative reduction potential indicates a greater tendency for oxidation.

Observe the general trend in standard reduction potentials for these metals: they become more positive as you move from Sc to Zn, indicating a decreasing tendency to be oxidized.

Explain the trend: The increasing nuclear charge across the period results in a stronger attraction between the nucleus and the electrons, making it harder for the metals to lose electrons and thus decreasing their tendency to be oxidized.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Standard Electrode Potential

Standard electrode potential is a measure of the tendency of a chemical species to be reduced, expressed in volts. It is determined under standard conditions and is crucial for predicting the direction of redox reactions. Higher standard potentials indicate a greater likelihood of reduction, while lower potentials suggest a greater tendency for oxidation.

First-Series Transition Metals

The first-series transition metals, which include elements from scandium (Sc) to zinc (Zn), are characterized by the filling of the 3d subshell. These metals exhibit variable oxidation states and complex ion formation, influencing their chemical behavior and standard electrode potentials. Understanding their electron configurations helps explain trends in their reactivity and potential values.

Trends in Oxidation Potentials

The trend in oxidation potentials for first-series transition metals generally shows a decrease from Sc to Zn. This trend can be attributed to the increasing nuclear charge and effective nuclear charge experienced by the d-electrons, which stabilizes the oxidation states. As the atomic number increases, the ability of the metal to lose electrons diminishes, leading to lower oxidation potentials.

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Textbook Question

Based on effective nuclear charge (Z_eff), which ion is the strongest oxidizing agent?

(a) Cu²⁺

(b) Ni²⁺

(d) Mn²⁺

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Textbook Question

What is the electron configuration of Co²⁺ and how many unpaired electrons are in the free transition metal ion?

(a) [Ar]3d⁵4s²; 5 unpaired electrons

(b) [Ar]3d⁵4s²; 1 unpaired electron

(d) [Ar]3d⁷; 1 unpaired electron

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Textbook Question

The oxalate ion is a bidentate ligand as indicated in Figure 21.8. Would you expect the carbonate ion to be a monodentate or bidentate ligand? Explain your reasoning.

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Textbook Question

Predict the number of unpaired electrons for each of the following.

(d) Cr³⁺

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Textbook Question

What is the crystal field energy level diagram for the complex [Fe(NH₃)₆]³⁺?

(a)

(b)

(c)

(d)