A fallback position of AGW proponents is that the extra carbon dioxide we add to the atmosphere will contaminate the oceans, leading to “ocean acidification”. This occurs due to the following reactions.
CO2 (g) -> CO2 (aq) [exothermic]
CO2 (aq) + H2O (l) -> H2CO3 (aq) [this is carbonic acid]
H2CO3 (aq) + H2O (l) -> HCO3- (aq) + H3O+ (aq)
This statement “ocean acidification” is itself a lie. This is because oceans are not acidic to begin with, they are alkaline (pH~8.1 depending on where you measure it). An acidic solution has a greater concentration of hydronium ions (H3O+) than hydroxide ions (OH-), while an alkaline solution is the other way around. But won’t increasing hydronium ion concentration by 30% make it acidic? No, because the pH scale is logarithmic, meaning a pH of 6 has ten times the concentration of H3O+ than one with a pH of 7. A pH of greater than 7 is alkaline, while less is acidic.
[H3O+] = 10^-8.1 M = 7.0 X 10^-9 M (M=Molarity- a measure of concentration)
7.0 X 10^-9 X 1.3 = 1.0 X 10^-8 M
pH = -log10(1.0 X 10^-8)
pH = 7.986
So then, an increased hydronium ion concentration by 30% will still leave us with an alkaline solution, meaning ocean acidification is not correct, it is ocean reduced-alkalinity. Pity that doesn’t sound as bad.
According to AGW theory however, the oceans will heat up, they actually haven’t but let’s suppose they’re right. As we can see by the first equation, the dissolving of carbon dioxide is exothermic, which means it releases heat, and hence is less efficient at higher temperatures. If the oceans would warm as AGW suggests, there wouldn’t be as much CO2 in the oceans, meaning the impact of ocean reduced-alkalinity is lessened. I have never seen an alarmist try to reconcile these two points.