称取含磷样品0.1000g,溶解后把磷沉淀为MgNH4PO4.此沉定过滤洗涤再溶解,最后用0.01000md/L的EDTA标准溶液滴定,消耗20.00mL.样品中P2O5的百分含量为()。已知M(MgNH4P04)=137.32g/mol,M(P2O5)=141.95g/mol.


称取含磷样品0.1000g,溶解后把磷沉淀为MgNH4PO4.此沉定过滤洗涤再溶解,最后用0.01000md/L的EDTA标准溶液滴定,消耗20.00mL.样品中P2O5的百分含量为()。已知M(MgNH4P04)=137.32g/mol,M(P2O5)=141.95g/mol.

A.13.79%

B.14.20%(正确答案)

C.27.46%

D.28.39%


Tag:配位滴定知识 样品 溶液 时间:2021-09-18 13:49:53