Hello people, I have an assignment regarding chemical equilibrium in the blood. I have been given basically two equations which I have to explain what they are, how the affect the body, pH and how they work.

The first equation is H^{+} (aq)+HCO-_{3}(aq)::equil::H_{2}CO-3(aq) ::equil::H_{2}O(l)+CO_{2}(g) (1)

I only know the extreme basics of the above equation. I need to link it with this equation

H_{3}O+(aq)+HCO_{3}-(aq)::equil::H_{2}CO_{3}(aq)+H_{2}O(l)::equil::2H_{2}O(l)+CO_{2}(g)

Now I dont know what this equation represents, I only know from an article that it has two reactions, one is an acid-base reaction and the other isn't. i've been trying to look for some info on this equation but can't find anything.

I need to come up with 500 words for each equation, but the best I can do is 224 words for the first equation. It seems like there is nothing else to talk about those two equations. If anyone can help it would be very much appreciated, thanks.