The prevailing scientific consensus on the origin of primordial water on Earth identifies two main possibilities: the Interstellar Origin, where primordial water was sourced from external bodies, and the Common Origin, which suggests that water formed alongside the planet. This paper supports the idea that primordial water may have formed during Earth’s formation. Nevertheless, it proposes a scenario in which the interplay of the primordial multilayered atmosphere, the primordial planetesimal crust, and, most importantly, various chemical reactions contributed to the global cycles of chlorate and ammonia. Within these cycles, a series of thermodynamically favorable chemical reactions and the conditions under which they occur are examined and discussed to substantiate the development of Earth’s primordial saline ocean water and nitrogen-rich atmosphere.