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更多“简述一些金属离子，如Fe3+、Cu2+等可在油脂氧化反应中发…”相关的问题
第4题
利用软锰矿(MnO2)制备硫酸锰时,常常存在Cu2+,Pb2+,Cd2+等杂质离子,试用计算说明如何除去.
利用软锰矿（MnO2)制备硫酸锰时,常常存在Cu2+,Pb2+,Cd2+等杂质离子,试用计算说明如何除去.
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第6题
根据电极电势，判断下列物质中最强的氧化剂和还原剂分别为（)。（jΘMnO4-/Mn2+=1.51V,jΘFe3+/Fe2+=0.77V,jΘZn2+/Zn=-0.76V)
A.MnO4-，Fe2+
B.MnO4-，Zn
C.Cu2+，Fe2+
D.Fe3+，Zn
第7题
A 25. 00 mL sample of unknown Fe3+ and Cu2+ required 16. 06 mL of 0. 050 8
A 25. 00 mL sample of unknown Fe3+and Cu2+required 16. 06 mL of 0. 050 83 mol·L-1EDTA for complete titrated. A 50. 00 mL sample of unknown was treated with NH4F to protect the Fe3+. Then the Cu2+was reduced and masked by addition of thiourea. Upon addition of 25. 00 mL of 0.050 83 mol·L-1EDTA, the Fe3+was liberated from its fluoride complex and formed an EDTA complex The excess EDTA required 19.77 ml of 0. 01883
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mol·L-1Pb2+to reach an endpoint using xylenol orange. Find the concentration of Cu2+in the unknown.
