When aqueous sodium hydroxide is added to aqueous hydrofluoric acid, the complete ionic equation is shown below.
Na⁺(aq) + OH⁻(aq) + HF(aq) → Na⁺(aq) + F⁻(aq) + H₂O(l)
Which of the following ions acts as a spectator in this reaction?
a) F−
b) OH−
c) Na+
d) H+