Final answer:
In the reaction NaNO₂(aq) + HI(aq), the base is NO₂⁻ because it accepts a proton to form HNO₂. This adheres to the Brønsted-Lowry definition of a base as a proton acceptor. So the correct answer is E.
Step-by-step explanation:
In the acid-base reaction NaNO₂(aq) + HI(aq) → NaI(aq) + HNO₂(aq), the base is the species that accepts a proton (H+). According to the Brønsted-Lowry theory, the base is defined as a proton acceptor.
In this reaction, the sodium nitrite (NaNO₂) dissociates in water to form Na+ and NO₂⁻ ions. The compound that accepts the proton here is the NO₂⁻ ion, as it gains a proton from HI to form HNO₂.
Therefore, the correct answer is e. NO₂⁻.
Here are a couple of examples of neutralization reactions and partial ionization:
- Neutralization reactions: HNO₃(aq) + Ba(OH)₂(aq) → Ba(NO₃)₂(aq) + 2H₂O(l)
- Partial ionization: HNO₂(aq) → H+(aq) + NO₂⁻(aq)