氢氧化钡少量时:
2KAl(SO4)2+3Ba(OH)2=Al(OH)3(沉淀）+2BaSO4(沉淀）+K2SO4
氢氧化钡过量时:
KAl(SO4)2+2Ba(OH)2=KAlO2+2BaSO4(沉淀）+2H2O