Thank you all for your insight. I think I am starting to get a handle on how all these factors are related to each other.

What amazes me is that for each X ppm of CO2 the pH would be lowered by a corresponding amount. I am correct thinking that at a pH of 8.2 there are 10X fewer H+ atoms than there would be at pH 7.2? What is going on with the H+ or OH- atoms as CO2 goes up?

Thank you.