The chemical equation below represents an acid-base reaction.

NO2-( aq) + H2O( l) → HNO2( aq) + OH -( aq)

The NO2-( aq) acts as...

A.
Brønsted Lowry acid
B.
Brønsted Lowry base
C.
Arrhenius acid
D.
Arrhenius base

1 answer

In the given reaction:

\[ \text{{NO}}_2^- (aq) + \text{{H}}_2\text{{O}} (l) \rightarrow \text{{HNO}}_2 (aq) + \text{{OH}}^- (aq) \]

the \(\text{{NO}}_2^-\) ion is acting as a proton acceptor because it takes a proton (H\(^{+}\)) from water (\(\text{{H}}_2\text{{O}}\)), which results in the formation of nitrous acid (\(\text{{HNO}}_2\)) and hydroxide ions (\(\text{{OH}}^-\)).

According to the Brønsted-Lowry acid-base theory:

  • A Brønsted-Lowry acid is a substance that donates a proton (H\(^+\)), while
  • A Brønsted-Lowry base is a substance that accepts a proton (H\(^+\)).

Since \(\text{{NO}}_2^-\) is accepting a proton, it acts as a Brønsted-Lowry base.

Therefore, the correct answer is:

B. Brønsted-Lowry base.

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