AP Chemistry
4.9 Oxidation-Reduction (Redox) Reactions
4.7 Types of Chemical Reactions
A student investigates the redox behavior of the nitrite ion, \(\text{NO}_2^-\text{(aq)}\), by carrying out two separate reactions in acidic solution:
Reaction 1:
\[ 5\,\text{NO}_2^-\text{(aq)} + 2\,\text{MnO}_4^-\text{(aq)} + 6\,\text{H}^+\text{(aq)} \rightarrow 5\,\text{NO}_3^-\text{(aq)} + 2\,\text{Mn}^{2+}\text{(aq)} + 3\,\text{H}_2\text{O(l)} \]
Reaction 2:
\[ 2\,\text{NO}_2^-\text{(aq)} + 2\,\text{I}^-\text{(aq)} + 4\,\text{H}^+\text{(aq)} \rightarrow 2\,\text{NO(g)} + \text{I}_2\text{(aq)} + 2\,\text{H}_2\text{O(l)} \]
Which of the following statements best justifies the chemical behavior of \(\text{NO}_2^-\text{(aq)}\) in these two reactions?
Reaction 1:
\[ 5\,\text{NO}_2^-\text{(aq)} + 2\,\text{MnO}_4^-\text{(aq)} + 6\,\text{H}^+\text{(aq)} \rightarrow 5\,\text{NO}_3^-\text{(aq)} + 2\,\text{Mn}^{2+}\text{(aq)} + 3\,\text{H}_2\text{O(l)} \]
Reaction 2:
\[ 2\,\text{NO}_2^-\text{(aq)} + 2\,\text{I}^-\text{(aq)} + 4\,\text{H}^+\text{(aq)} \rightarrow 2\,\text{NO(g)} + \text{I}_2\text{(aq)} + 2\,\text{H}_2\text{O(l)} \]
Which of the following statements best justifies the chemical behavior of \(\text{NO}_2^-\text{(aq)}\) in these two reactions?
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