The buffering system in the blood involves carbonic acid ( H2CO3 ) and the bicarbonate ion ( HCO−3 ). The reaction is H2CO3(aq)+H2O(l)↽−−⇀HCO−3(aq)+H3O+(aq) H 2 ⁢ CO 3 ⁢ ( aq ) + H 2 O ( l ) ⁢ ↽ − − ⇀ ⁢ HCO 3 − ⁢ ( aq ) + H 3 ⁢ O + ⁡ ( aq ) A. What will happen to the equilibrium if the amount of bicarbonate ion is increased? The equilibrium will shift to the right. The equilibrium will not change. The equilibrium will shift to the left. B. What will happen to the equilibrium if the concentration of carbonic acid is increased? The equilibrium will not change. The equilibrium will shift to the left. The equilibrium will shift to the right.