Question

取2g含有杂质NaCl的硫酸钠溶于水后滴加BaCl2溶液到沉淀不再生成为止生成3.2克沉淀求硫酸钠中杂质的质量分

Answer 1

设纯Na2SO4质量x

Na2SO4+BaCl2=2NaCl+BaSO4↓

142````````````````````````233

x``````````````````````````3.2g

142:x=233:3.2g

解得x≈1.95g

因此杂质质量分数约为(2g-1.95g)/2g=2.5%