someone correct me if I’m wrong.
Oxygen is carried by Hb. But carbondioxide is usually carried in the structure of Hco3 in blood. Also note that CO2 makes the environment acidic. (a simple example: Cola has CO2 and it is acidic) Or in other words decreases the PH.
Oxygen is carriend in the blood as oxyhemoglobine. 1% is disolved in the blood.
CO2 is carried 70% under the form of sodium carbonate and potasium carbonate(in some books none of these is mentioned but a calcium carbonate is mentioned- THIS IS NOT TRUE- CaHCO3 can not be in the blood-the body does not allow this). 23% is disolved in the blood and 7% is in the red blood cells as carbohemoglobine(carboaminohemoglobine- it is the same thing)
I could tell you more detalies but i am lazy