Question

为测定某K2SO4溶液,取25.00mL待测液,向其中加入过量的BaCI2溶液.充分反应后过滤并干燥,得到BaSO4沉淀

Answer 1

n(BaSO4)=m/M=1.165/233=0.005mol

设K2SO4物质的量为x

K2SO4+BaCI2==BaSO4+2KC1

1 1

x 0.005mol

x=0.005mol

c=n/v=0.005/0.025=0.2mol/L