Answer:
AlPO4(s) + H3O+(aq) --------------> Al3+(aq) + HPO4^2-(aq) + H2O(l)
Explanation:
The net ionic equation for the reaction between aluminum phosphate and hydronium ion shown below.
AlPO4(s) + H3O+(aq) --------------> Al3+(aq) + HPO4^2-(aq) + H2O(l)
Note H3O+(aq) comes from an acid. The acid is required to keep the Al3+(aq) in aqueous solution. If not, it will precipitate as Al(OH)3.