# What is a spectator ion in the reaction between NaOH(aq) and H_2SO_4(aq)?

$2 N a O H \left(a q\right) + {H}_{2} S {O}_{4} \left(a q\right) \rightarrow N {a}_{2} S {O}_{4} \left(a q\right) + 2 {H}_{2} O \left(l\right)$
The sodium sulfate is present in solution as $2 \times N {a}^{+}$ plus $S {O}_{4}^{2 -}$, ionic species solvated by water molecules.