Mark the concentration for each ion clearly in a box.
For a H3PO4 solution:
1. Write down the three equations for the stepwise dissociation of phosphoric acid
2. Write down all the equilibrium expressions for all the steps of this dissociation.
3. Determine the pH and the concentration of H2PO4^- , HPO4 ^-2 and PO4^3- ions for a 9.0M H3PO4 solution.