The spectator ions in the reaction are Ba²⁺ and S²⁻.
Spectator ions are ions that do not take part in the chemical reaction but are present in the reaction mixture. These ions are unchanged throughout the reaction and are called spectator ions because they are simply "observing" the reaction.
Spectator ions can be either cations (positively charged ions) or anions (negatively charged ions). Examples of spectator ions include sodium (Na⁺), chloride (Cl⁻), and sulfate (SO₄²⁻).
In aqueous solutions, the most common spectator ions are the ions of the solvents, such as water, that are present in the reaction mixture.
In addition, complex ions, which are composed of two or more ions, may act as spectator ions. For example, in a precipitation reaction, the spectator ions are the ions that do not take part in forming the precipitate.
In the given question,
The molecular equation of the reaction is
Ba(OH), (aq) + H₂S(aq) → BaS(s)+2H₂0(l)
The ionic equation is given by
Ba²⁺ + 2OH⁻ +2H⁺ + S²⁻→ 2H₂0(l) + Ba²⁺ + S²⁻
The net ionic equation is:
2OH⁻ + 2H⁺ → 2H₂O(l)
Hence, Ba²⁺ and S²⁻ are the spectator ions.
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