Water Chemistry (I)
The worldís oceans have a pH of about 8 - a weak base
Rainwater has a pH of about 6 - a weak acid
Some elements, like Fe can exist in more than one oxidation state....Fe metal, Fe 2+ (has lost two electrons) and Fe 3+ (has lost three electrons).
Some components (like Oxygen) are good Oxidizing agents and remove electrons.
Other components produce a reducing environment and supply electrons