向20ml1mol|L Al2(SO4)3溶液中滴加0.2mol|L NaOH溶液,最后0.78克沉淀生成,

1 Al2(SO4)3 + 6NaOH = 2Al(OH)3 + 3Na2SO4
1mol 6mol 156g
0.2*x/1000 0.78g
x = 150mL
2 Al2(SO4)3 + 6NaOH = 2Al(OH)3 + 3Na2SO4
1mol 6mol 156g
20*1mmol 0.2*ymmol zg
y = 600mL
z = 3.12g
Al(OH)3 + NaOH = NaAlO2 + 2H2O
78g 1mol
( 3.12-0.78)g 0.2a/1000
a = 150mL
a+y = 750mL
不足时用掉150mL,过量时用掉750mL