[bowl]

My hypothesis first is: In the process of reduction, a substance gains hydrogen and loses oxygen. Therefore, in an anaerobic or reduction environment, there is more hydrogen and oxygen. Since there is more hydrogen, the pH is more acidic.

My second hypothesis is: The concentration of H+ ions in a solution increases as the CO2 level increases. The less oxygen, the less CO2, since oxygen is an element in the CO2 compound. The less CO2, the less H+, which means a higher pH.

Which one is correct?

Or are they both wrong?

Excuse my ignorance

Thank you!