(BeAl2)O4 + 4NaOH + 4H2O → Na2[Be(OH)4] + 2Na[Al(OH)4]
Aluminium-beryllium oxide react with disodium hydroxide and water to produce sodium tetrahydroxoberyllate(II) and sodium tetrahydroxoaluminate(III). Sodium hydroxide - concentrated heated solution.