[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f6baL3A2PU09RtK-14vD7n5VDMReb9_84LtRnRQv-4rs":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-11-12 08:03:56",232328512,[8,9,10,11],"指示剂不稳定","MIn溶解度小","滴定反应不能进行","指示剂与干扰离子生成NIn",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},15,"b2d6a0616a18045448b6a81cc5f41bb3","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4f4a13e493f73e8a3d9b286b53d82157.png","分析化学","work_47997075","函数极限的四则运算","产生金属指示剂的僵化现象是因为( )",[21,32,41,50,53,62,71,80,89,96],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],232328509,[25,26,27,28],"Pb(NO3)2","Na2CO3","Zn","CaCO3","现要用EDTA滴定法测定某水样中Ca2+的含量,则用于标定EDTA的基准物质应为( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],232328510,[36,37,38,39],"酚酞","二甲酚橙","二苯胺磺酸钠","淀粉","以EDTA滴定Zn2+,选用( )作指示剂",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],232328511,[45,46,47,48],"酒红色→纯蓝色","纯蓝色→酒红色","纯蓝色→紫色","酒红色→无色","以铬黑T为指示剂,在pH=10的氨性缓冲溶液中,用EDTA标准溶液滴定Mg2+时,滴定终点时颜色转变应是( )",{"answer":51,"createTime":5,"id":6,"options":52,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],232328513,[57,58,59,60],"控制酸度法","配位掩蔽法","氧化还原掩蔽法","沉淀掩蔽法","测定水中钙硬度时,Mg2+的干扰用的是( )消除的",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],232328514,[66,67,68,69],"中和过多的酸","调节pH值","控制溶液的酸度","起掩蔽作用","用Zn2+标准溶液标定EDTA时,体系中加入六亚甲基四胺的目的是( )",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],232328515,[75,76,77,78],"KCN","三乙醇胺","氢氧化钠","NH4F","以铬黑T为指示剂,用EDTA滴定Ca2+、Mg2+时,Fe3+和Al3+对指示剂有封闭作用,为消除Fe3+和Al3+对指示剂的封闭作用可加入的试剂为( )",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],232328516,[84,85,86,87],"CMKy¢MY\u002F CNKy¢NY³105","CMKy¢MY\u002F CNKy¢NY³10-6","CMKy¢MY\u002F CNKy¢NY³108","CMKyMY\u002F CNKy¢NY³10-8","当溶液中有两种(M,N)金属离子共存时,欲以EDTA滴定M而使N不干扰,则要求 ( )",{"answer":90,"createTime":5,"id":91,"options":92,"question":95,"source":30,"type":31},[],232328517,[93,94,10,11],"MIn溶解度太大","MIn溶解度太小","在配位滴定中,有时出现指示剂的僵化现象,其原因是 ( )",{"answer":97,"createTime":5,"id":98,"options":99,"question":104,"source":30,"type":31},[],232328518,[100,101,102,103],"防止干扰","防止 Zn2+水解","使金属离子指示剂变色更敏锐","加大反应速度","EDTA滴定Zn2+时,加入NH3 — NH4Cl可( )"]