Consider the following set of oxides: SrO, ZrO2, MoO3, and RuO4. If needed, take the radius of R

step 1 In this question, we have to identify each of the 10 given compounds as acidic or basic or ampho

Consider the following set of oxides: SrO, ZrO2, MoO3, and...

Consider the following set of oxides: $\mathrm{SrO}, \mathrm{ZrO}_2, \mathrm{MoO}_3$, and $\mathrm{RuO}_4$. If needed, take the radius of $\mathrm{R} \mathrm{u}^{8+}$ to be $52 \mathrm{pm}$. a. Which of these oxides will be soluble in water and give a basic solution? Write a chemical equation for this process. b. Which of these oxides will be soluble in water and give an acidic solution? Write an equation for this process. c. Which of these oxides (if any) will consist of small molecules? d. Which of these oxides (if any) will most easily become a gas?

Key Concepts

Acid?Base Character of Metal Oxides

Metal oxides can be classified based on their acid–base behavior. Generally, oxides of metals in low oxidation states (or with less polarizing cations) tend to be basic and form hydroxides when dissolved in water, whereas oxides of metals in high oxidation states (which are more polarizing) tend to be acidic and form oxyacids upon hydrolysis. This concept underpins the reactions where, for example, a basic oxide reacts with water to produce a metal hydroxide, while an acidic oxide reacts to yield an acid solution.

Hydrolysis of Metal Oxides

Hydrolysis is the reaction between an oxide and water, leading to the formation of either an acidic or basic solution. The nature of the products depends on the acid–base character of the oxide. Basic oxides generate hydroxides, whereas acidic oxides form acids. This reaction mechanism is key to understanding the behavior of many metal oxides when they interact with water.

Molecular versus Extended Structures in Oxides

Metal oxides can exist as discrete molecular entities or as extended network solids. Molecular oxides are composed of small, volatile units with defined geometries, while network solids have a continuous three?dimensional structure. The molecular nature influences properties such as solubility and volatility, determining, for instance, whether an oxide will form small molecules or remain in a solid, non?volatile form.

Volatility of Oxides

Some metal oxides, especially those that exist as small, discrete molecular species, can easily vaporize. The volatility of an oxide depends on its molecular structure, bonding, and the overall energy required to break intermolecular forces in the condensed phase. This property is particularly important in processes where oxides might be lost as gases, affecting both their handling and environmental impact.

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