I am planning to investigate the relationship between $\mathrm{pH}$ and dissolved oxygen.
I would like to have a reason without taking in account the plants, animals and decomposer roles.
I want to know if $\mathrm{pH}$ affects the concentration of dissolved oxygen. For example:
If I added $\ce{HCl}$ to water, would the concentration of DO change? In same way, if I add $\ce{NaOH}$, would the concentration of DO change?