[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fGdUT7J3ng9pB5B1VvrEJai8uA6CMC1OirtQDXsS5cqE":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2024-04-29 18:32:08",140966543,[8,9,10,11],"变色灵敏","有封闭可能","有僵化可能","无法确定",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},37,"ed95dd46d5e443f7b65273f423b0039e","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fdb3a5eb6177bf85ad556cb52c242afa2.jpg","分析化学(A)","work_34377372","","在EDTA配位滴定中,当 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe6bc03231b5fc056a4639df09e2c2bd4.png\">,则此指示剂在终点时将",[21,26,35,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],140966544,[30,31,32,33],"1.29","-9.40","10.69","9.40","用EDTA滴定Ca2+反应的\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbdbf3e9f5943c7de1cf263240a640fdc.png\">=10.69.当pH=9.0时,Y4-的lgαY(H)=1.29,则该反应的\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc4c26a068d9aa9ba2ac0ec812b254dc5.png\">等于",{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":24,"type":25},[],140966545,[39,40,41,42],"被滴物M在终点时未反应的浓度的负对数","被滴物M在化学计量点时未反应的浓度的负对数","A与B两项的负对数之差值","A与B两项中浓度之差值","EDTA配位滴定终点误差公式中的\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6e612dd43a360f16b81d78b19780ec41.png\">表示",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":24,"type":25},[],140966546,[48,49,50,51],"0.36%","28%","2.8%","3.6%","某酸度下的EDTA溶液中,Y4-的酸效应系数αY(H)=28,则该离子在溶液中所占的百分比为",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":24,"type":25},[],140966547,[57,58,59,60],"配位掩蔽","调节酸度","将Fe3+沉淀分离","氧化还原掩蔽","已知\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4f1053c972106f1b30d439be3c29bcfa.png\">= 27.9,\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6102f61ea87aeff16decfdee01923d87.png\"> = 25.1 (Fe3+), \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6102f61ea87aeff16decfdee01923d87.png\">=14.3 (Fe2+).欲用EDTA测定Fe3+,Bi3+混合溶液中,Bi3+.消除Fe3+的干扰应采用的方法是",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":24,"type":25},[],140966548,[66,67,68,69],"用于配制PAN的溶剂是乙醇","PAN适用的pH范围很宽,为2~12","PAN指示剂最适用于EDTA滴定钙镁总量","PAN与大多数金属离子(Cu2+,Zn2+除外)形成难溶配合物","在EDTA配位滴定中,下列有关PAN指示剂的叙述错误的是",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":24,"type":25},[],140966549,[75,76,77,78],"KCN或抗坏血酸","盐酸羟胺或三乙醇胺","三乙醇胺或KCN","盐酸羟胺或抗坏血酸","用EDTA滴定Ca2+,Mg2+时,为消除Fe3+的干扰,应选用的掩蔽剂是",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":24,"type":25},[],140966550,[84,85,86,87],"偏高","偏低","不能确定","无影响","用含有少量Cu2+的蒸馏水配制EDTA溶液,在pH=5,以二甲酚橙为指示剂,用锌标准溶液标定EDTA溶液的浓度,然后用此EDTA溶液在pH=10,以铬黑T为指示剂滴定试样中的Ca2+.测定结果将:(已知\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F15f2d16b4a87cd566a49877be3d1efdf.png\">=18.8, \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F82520634ae934bb806c9e339982c3ccd.png\">= 16.5, \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbdbf3e9f5943c7de1cf263240a640fdc.png\">=10.7)",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":24,"type":25},[],140966551,[93,94,95,96],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F01bb1c57f676a45f9f8efbf3c94dfcc8.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffaf362ef818024fbc6ff17a262bc6dd0.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6f24b40991467f9ae1fd35e37b865fd9.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff1d4df0c4921d443eaff0aa7986ad6a.png\">","在氨性缓冲溶液中,用EDTA标准溶液滴定Zn2+.滴定到达化学计量点时,下述关系式成立的是",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":24,"type":25},[],140966552,[102,103,104,105],"159.7","79.85","319.4","6.262","20.00 mL 0.0500 mol·L-1 EDTA溶液相当于Fe2O3 (M=159.7 g·mol-1)的质量(单位:mg)为"]