Question

4.有一硫酸和硝酸的混合溶液,取出其中的10mL,加入足量的BaCl2溶液,过量,洗涤,烘干后得到9.32g沉淀,其滤液

Answer 1

n(H2SO4)=9.32/233＝0.04molc(H2SO4)=0.04/0.01＝4mol/Ln(OH-)=4*0.035=0.14moln(H+)=n(OH-)=0.14mol

n(HNO3)=（0.14－0.04*2）/2＝0.03mol c(HNO3)=0.03/0.01＝3mol/L