I am having trouble grasping the material. Please help explain each.

{We breathe out CO2 gas. In our blood CO2 is present as carbonic acid which has a pka of 6.36.) 1. Using Lewis structures draw the equations for the equilibrium reaction of water and carbon dioxide to form carbonic acid (H2CO3). (b) Then draw the equilibrium reaction of carbonic acid (H2CO3] donating one proton to water to produce bicarbonate anion. (a) (b) 2. Protons transfer immediately between acids and bases to reach an equilibrium. In the following acid base reactions, draw Lewis structures for the conjugate acid and conjugate base formed when the reactants (on the left) are mixed. (a) CH3C(=O)OH + NH3 acetic acid (conj, acid (conj, base) (b) HC(=O)OH + CH,CH2NH2 formic acid (conj, acid (conj. base) (c) CH3CH2CH2C(=O)OH + NaOH [Na/C1") + H2O butanoic acid 3. By definition the pH of a dilute solution of a weak acid equals its pka only when the concentrations of unionized acid (HA) equals the concentration of its ionized conjugate base [A"). At any given pH an acid will be mostly ionized or unionized depending on its pka. Given the following weak acids and their pka's decide whether the acid is mostly ionized or mostly unionized at the pH shown. [a] CH,C=O)OH (pKa = 4.76) at pH = 5.76 [b] HC(=O)OH pka = 3.75) at pH = 2.75 (c) CH.CH.CH NH, Ipka = 10.7) at pH = 8.7 [d] HAS {pka = 7.0) at pH = 2 [e] CH,OH Ipka = 15.5] at pH=9.5