HELP!!! concentrations of ions 1. The problem statement, all variables and given/known data Determine the concentration for the following ions: H2PO4- HPO4^2- PO4^3- in the dissociated of 7.0M H3PO4 solution 2. Relevant equations I know that the number given is a phosphoric acid and is a triprotic acid. Concentration of atoms example are Na2CO3 (s) → 2 Na+(aq)+ CO32-(aq) [Na+] = 2 × [Na2CO3] = 2 × 0.20 M = 0.40 M [CO32-] = 1 × [Na2CO3] = 1 × 0.20 M = 0.20 M 3. The attempt at a solution so is it H2PO4-(aq) + H2O(l) = H30(aq) + H2PO4^2-(aq) [H2PO4-]= 1 x [H2PO4-] = 1 x 7.0 = 7M then do the same thing for the two instead of 1 do 2 and 3 respectively next.