Question

一题关于沉淀的化学题称取一含银废液2.075g,加适量硝酸,以铁铵矾作指示剂,用0.04634mol/L NH4SCN溶

Answer 1

n(NH4SCN)=0.04634mol/L x25.50/1000 L=0.00118167 mol NH4SCN ＋ Ag+ =AgSCN↓(白色)+ NH4+ ∴n(Ag+)=n(NH4SCN)=0.00118167 mol ∴m(Ag+)=nM=0.127g