Answer:
A) K₂O(s) + H₂O(l) → 2K⁺(aq) + OH⁻(aq)
C) Al₂O₃(s) + 6OH⁻(aq) + 3H₂O(l) → 2Al(OH)₄⁻(aq)
E) SiO₂(s) + 2OH⁻(aq) → SiO₃²⁻(aq) + H₂O(l)
These reactions show oxides acting as bases by reacting with water (H₂O) to produce hydroxide ions (OH⁻) in solution
Explanation:
Let's break down each reaction and explain why the oxides are acting as bases:
[tex]A) \( \text{K}_2\text{O(s)} + \text{H}_2\text{O(l)} \rightarrow 2\text{K}^+(\text{aq}) + \text{OH}^-(\text{aq}) \)[/tex]
In this reaction, potassium oxide
[tex](\( \text{K}_2\text{O} \))[/tex] reacts with water
[tex](\( \text{H}_2\text{O} \)).[/tex] The oxide ion
[tex](\( \text{O}^{2-} \))[/tex] from potassium oxide accepts a proton (H⁺) from water, forming hydroxide ions
[tex](\( \text{OH}^- \)).[/tex] Since the oxide ion accepts a proton and generates hydroxide ions, it is acting as a base.
[tex]C) \( \text{Al}_2\text{O}_3(\text{s)} + 6\text{OH}^-(\text{aq}) + 3\text{H}_2\text{O}(\text{l)} \rightarrow 2\text{Al(OH)}_4^-(\text{aq}) \)[/tex]
Here, aluminum oxide
[tex](\( \text{Al}_2\text{O}_3 \))[/tex] reacts with hydroxide ions
[tex](\( \text{OH}^- \))[/tex] and water. The oxide ions from aluminum oxide combine with water molecules and hydroxide ions to form aluminum hydroxide ions
[tex](\( \text{Al(OH)}_4^- \)).[/tex] Again, since the oxide ions accept protons from water and hydroxide ions, they behave as bases.
[tex]E) \( \text{SiO}_2(\text{s)} + 2\text{OH}^-(\text{aq}) \rightarrow \text{SiO}_3^{2-}(\text{aq}) + \text{H}_2\text{O}(\text{l}) \)[/tex]
In this reaction, silicon dioxide
[tex](\( \text{SiO}_2 \))[/tex] reacts with hydroxide ions
[tex](\( \text{OH}^- \)).[/tex] The oxide ions from silicon dioxide react with hydroxide ions to form silicate ions
[tex](\( \text{SiO}_3^{2-} \))[/tex] and water. Once again, the oxide ions are accepting protons and generating hydroxide ions, indicating their behavior as bases.
In each of these reactions, the oxide ions from the respective compounds are accepting protons (H⁺ ions) from water or hydroxide ions, leading to the generation of hydroxide ions in solution. This characteristic of oxides to accept protons and generate hydroxide ions is a typical behavior of bases. Therefore, these reactions demonstrate oxides acting as bases.
