Is sodium iodide an acid or a base?

Sodium iodide (NaI) is neither an acid nor a base; it is classified as a neutral salt. When sodium iodide is dissolved in water, it dissociates into sodium ions (Na⁺) and iodide ions (I⁻). Neither of these ions reacts with water to produce hydrogen ions (H⁺) or hydroxide ions (OH⁻), which means that the solution does not have acidic or basic properties.

In summary, sodium iodide is the result of the neutralization reaction between a strong acid (hydroiodic acid, HI) and a strong base (sodium hydroxide, NaOH). This neutralization results in a salt that does not affect the pH of a solution significantly, thus confirming that it is neutral.