2K3PO4 + 2Al + 8H2O → 2K[Al(OH)4] + 2K2HPO4 + 3H2
Tripotassium phosphate react with aluminum and water to produce potassium tetrahydroxoaluminate(III), potassium hydrogen phosphate and hydrogen. Tripotassium phosphate - concentrated solution. The reaction takes place in a boiling solution.