50ml0.02mol/LBaCl2溶液与15g10%的H2SO4溶液(密度为1.07g/cm3)混合,计算

问题描述:

50ml0.02mol/LBaCl2溶液与15g10%的H2SO4溶液(密度为1.07g/cm3)混合,计算
(1)生成沉淀的质量
(2)反应结束后溶液中剩余(酸或盐)的物质的量的浓度(设溶液的总体积不变)

BaCl2+H2SO4==BaSO4+2HCl
n(BaCl2)=0.05*0.02=0.001mol
n(H2SO4)=15*0.1/98=0.015mol
所以H2SO4过量,以B aCl2计算,则n(BaSO4)=n(BaCl2)=0.001mol
所以,m(BaSO4)=0.001molx233=0.233g
V(H2SO4)=15/1.07=14ml
剩余n(H2SO4)=0.015-0.001=0.014mol
故c(H2SO4)=0.014/(50+14)*1000=0.22mol/L