Here's why:

* Acids donate protons (H+) in solution.

* Bases accept protons (H+) in solution.

* Salts are ionic compounds formed by the reaction of an acid and a base.

Barium iodide is formed by the reaction of barium hydroxide (a strong base) and hydroiodic acid (a strong acid):

Ba(OH)₂ + 2 HI → BaI₂ + 2 H₂O

Since it is formed from the neutralization reaction of a strong acid and a strong base, barium iodide is a neutral salt. It doesn't have a significant tendency to donate or accept protons in solution.