Here's why:

* Weak acids only partially ionize in solution. This means that they don't completely break apart into their ions (H+ and OCl- in this case).

* Hypochlorous acid has a relatively low Ka value. Ka is the acid dissociation constant, which measures the extent to which an acid ionizes. A lower Ka value indicates a weaker acid. The Ka of hypochlorous acid is around 3.0 x 10^-8.

In contrast, strong acids like hydrochloric acid (HCl) completely ionize in solution, meaning they donate all their hydrogen ions (H+) to water.