Phosphate is derived from the titration of phosphoric acid, h3po4. the three pka’s of h3po4 are 2.15, 7.20, and 12.35 respectively. 

a/ write out the series of ionization (equilibrium) reactions corresponding to each ionization, making sure to write out the (flat) structure each molecule/ion as you do so. mark correct chemical bonds.

b/ in your diagram above, circle the dominant form of phosphate as it would appear at ph 5.7.