What are the spectator ions in 2H+ + SO42- + Ca2+ + 21- → CaSO4 + 2H+ + 21-

H⁺ and I⁻ ions

Explanation:

Spectator ions are ions that appear in a solution but do not take part in the chemical reaction. This ions remain unchanged before and after the chemical equation.

From the equation:

2H⁺ + SO₄²⁻ + Ca²⁺ + 2I⁻   ⇒   CaSO₄ + 2H⁺ + 2I⁻

We can see that both H⁺ and I⁻ ions remain unchanged as the reaction occurs, therefore they are spectator ions. Removing the spectator ions gives a net ionic equation:

SO₄²⁻ + Ca²⁺    ⇒   CaSO₄

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.