The spectator ions in the reaction between aqueous hydrofluoric acid and aqueous barium hydroxide are ba2+ only oh- and f- oh-, f-, and ba2+ f- and ba2+ h+, oh-, f-, and ba2+

The spectator ions in the reaction between aqueous hydrofluoric acid and aqueous barium hydroxide are Ba⁺² only.
The Spectator ions are those ions in the reaction which are on both sides of the equation, on reactants side and product side in the same form, and also do not have any effect on the equilibrium of the equation. So, in this case Ba⁺² is that ion in the reaction of Barium hydroxide and aqueous hydroflouric acid.

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