Now, carbonic acid, H two CO2, is a weak acid and that means it will dissociate into bicarbonate, the conjugate base to this acid, as well as a hydrogen ion. Now, this hydrogen ion ultimately leads to the bore effect. It binds onto a special allosteric site on our hemoglobin and that causes the hemoglobin to decrease its affinity for oxygen. And that leads to more oxygen diffusing out of the red blood cell and into the cells of our tissue. Now, what happens to our bicarbonate ion? Well, the bicarbonate ion ultimately leaves the red blood cells found next to our tissues.