Problem 61 - Chemistry The Central Science In Si Units

Question

Would you expect zirconium(II) oxide, \(\mathrm{ZrO},\) to react more readily with \(\mathrm{HCl}(a q)\) or \(\mathrm{NaOH}(a q) ?\)

Step-by-Step Solution

Answer

Zirconium(II) oxide, \( \text{ZrO} \), would react more readily with \( \text{HCl} \) than with \( \text{NaOH} \).

Step 1: Understanding the Nature of the Compound

Zirconium(II) oxide, \( \text{ZrO} \), is a compound in which zirconium is in a lower oxidation state than is typically stable. Compounds with a metal like zirconium tend to have basic properties, especially when the metal is in a low oxidation state.

Step 2: Chemical Reaction Analysis

Basic oxides are more likely to react with acids. This is because basic oxides can neutralize acidic solutions by forming water and a salt. \( \text{ZrO} \), being a basic oxide, will potentially react with \( \text{HCl} \), a strong acid, to form a zirconium chloride salt and water.

Step 3: Checking for Base Reaction

\( \text{ZrO} \) with \( \text{NaOH} \), which is a strong base, would likely result in little to no reaction since both are basic in nature. Basic oxides do not typically react with bases because they do not neutralize each other.

Key Concepts

Zirconium(II) oxide

Zirconium(II) oxide, denoted as \( \mathrm{ZrO} \), is an interesting compound due to its unique chemical properties. Zirconium, as a metal, is usually found in higher oxidation states, but in this case, it is in a +2 oxidation state. This lower oxidation state lends certain basic characteristics to zirconium(II) oxide.

These basic properties arise because metals like zirconium, when in lower oxidation states, tend to donate electrons more easily, hinting at a certain affinity towards acids, which seek electrons. Due to its basic oxide nature, \( \mathrm{ZrO} \) can participate in reactions typical of basic oxides, such as reacting with acids to form salts and water. Understanding the properties of zirconium(II) oxide is critical for predicting how it will behave in various chemical reactions.

Basic Oxides

Basic oxides are compounds commonly formed by metal elements in lower oxidation states. They have the unique characteristic of reacting with acids in a manner similar to a base, by neutralizing the acid. The general reaction for basic oxides with acids is the formation of water and a corresponding salt.

These reactions demonstrate the amphoteric nature of oxides associated with metals like zirconium, which, in low oxidation states, form basic oxides. This means zirconium(II) oxide will typically be attracted to and react with substances with acidic properties, such as hydrochloric acid (\( \mathrm{HCl} \)).

• Basic oxides + acids → salt + water
• Example: \( \mathrm{ZrO} \) + \( \mathrm{HCl} \) → zirconium chloride + water

This chemistry forms the basis for predicting and understanding chemical reactivity and interaction with different compounds.

Acid-Base Reactions

In chemistry, acid-base reactions are fundamental as they often involve the donation and acceptance of electrons, leading to the formation of water and a salt, which are usually neutral compounds. Understanding these reactions helps explain the behavior of basic oxides like \( \mathrm{ZrO} \).

When \( \mathrm{ZrO} \) comes into contact with an acid, such as \( \mathrm{HCl} \), it's likely to react because the oxide can neutralize the acid. This reaction involves the exchange of ions, leading to the formation of zirconium chloride and water.

• Basic oxide (\( \mathrm{ZrO} \)) + acid (\( \mathrm{HCl} \)) → salt (zirconium chloride) + water

Conversely, when a basic oxide encounters a base, such as \( \mathrm{NaOH} \), there is minimal to no reaction. Since both systems are basic, there is no neutralization, and hence no reaction product of interest is formed. This is key in differentiating which substances \( \mathrm{ZrO} \) will more readily react with, as seen when compared to an acid or another base.