Write balanced net ionic equations for the following reactions in acidic solution. (b) TeO₂(s) + Cr²⁺(aq) → Te(s) + Cr³⁺(aq)

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Step 1: Identify the oxidation and reduction processes. TeO₂ is reduced to Te, and Cr²⁺ is oxidized to Cr³⁺.

Step 2: Write the half-reactions for the oxidation and reduction processes. Reduction: TeO₂(s) → Te(s). Oxidation: Cr²⁺(aq) → Cr³⁺(aq).

Step 3: Balance the atoms other than O and H in each half-reaction. The reduction half-reaction is already balanced for Te, and the oxidation half-reaction is balanced for Cr.

Step 4: Balance the oxygen atoms by adding H₂O to the side that needs oxygen. For the reduction half-reaction: TeO₂(s) + 2H₂O(l) → Te(s).

Step 5: Balance the hydrogen atoms by adding H⁺ to the side that needs hydrogen. Then, balance the charges by adding electrons. Combine the balanced half-reactions to form the net ionic equation.

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Net Ionic Equations

Net ionic equations represent the actual chemical species that participate in a reaction, excluding spectator ions. They focus on the ions and molecules that undergo a change during the reaction, providing a clearer picture of the chemical processes involved. To write a net ionic equation, one must first write the complete ionic equation and then eliminate the spectator ions.

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00:51

Net Ionic Equations

Acidic Solution

An acidic solution is characterized by a higher concentration of hydrogen ions (H⁺) than hydroxide ions (OH⁻). In such environments, certain reactions may proceed differently due to the presence of H⁺ ions, which can influence the oxidation states of elements and the overall reaction pathway. Understanding the role of acidity is crucial for predicting the products and balancing the equations correctly.

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01:39

Solution Components

Oxidation and Reduction

Oxidation and reduction (redox) reactions involve the transfer of electrons between species, leading to changes in their oxidation states. In the given reaction, TeO₂ is reduced to Te, while Cr²⁺ is oxidized to Cr³⁺. Identifying which species is oxidized and which is reduced is essential for balancing the net ionic equation and understanding the underlying chemical transformations.

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