Question

取6 g铝土矿(含Al2O3、Fe2O3)样品,放入盛有100 mL H2SO4溶液的烧杯中,充分反应后过滤,向滤液中加

Answer 1

Al（OH）3+OH- == （AlO2）-+ H2O

n(AL3+)=△NaOH=10ml*10mol/L=0.1mol

n（AL2O3）=0.05mol

m(AL2O3)=0.05*102=5.1g

m(Fe2O3)=6-5.1=0.9g

Fe2O3+3H2SO4==Fe2(SO4)3+3H2O

160294

0.9g x1

x1=1.65375g

AL2O3+3H2SO4=AL2(SO4)3+3H2O

102 294

5.1x2

x2=14.7g

n(H2SO4)2=5/40 /2=0.0625mol

x1+x2=1.65375+14.7=16.35375g

n(H2SO4)=n1+n2=0.166875+0.0625=0.229375mol

c(H2SO4)=0.229375mol/0.1L=2.29375mol/L