HClO refers to hypochlorous acid, which is a weak acid commonly found in bleach. It dissociates in water to produce hydrogen ions (H+) and hypochlorite ions (ClO-).
Related terms
Hypochlorite ion (ClO-): The negative ion produced when HClO dissociates in water.
Weak acid: An acid that partially dissociates in water, resulting in fewer hydrogen ions being released.