Ba + 2 H2O -----> Ba(OH)2 + H2
0,09.........................0,09
Al2(SO4)3+3Ba(OH)2----->3BaSO4+2Al(OH)3
0,025...............0,075.................0,075....0,05
Ba(OH)2+2Al(OH)3----> Ba(AlO2)2 +4H2O
0,015.........0,03
=> khối lượng chất rắng =0,075.233+(0,05-0,03).78=19,035 g