The irritation caused by red ant's bite is due to

Explanation

The primary culprit behind the painful sting of a red ant bite is formic acid (HCOOH). This colorless, pungent acid is secreted by most ant species, including red ants, and serves as a defensive weapon against predators. When an ant bites, it injects a small amount of formic acid into the victim's skin. This acid readily dissociates in water, releasing hydrogen ions (H⁺) which:Activate pain receptors: The H⁺ ions stimulate pain receptors in the skin, causing the immediate burning and sharp stinging sensation.Cause tissue damage: Prolonged exposure to formic acid can irritate and damage skin cells, leading to redness, swelling, and itching.