16[B(NH3)F3] + 14NaOH + 9H2O → 12Na[BF4] + Na2B4O7 + 16(NH3•H2O)
Trifluoroammineboron(III) react with sodium hydroxide and water to produce sodium tetrafluoroborate(III), sodium tetraborate and ammonium hydroxide. Sodium hydroxide - diluted cold solution.