[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fV6uqv2sKrazckrERYWlG0GQR10pS1nqFMZucO8Dj_-M":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2026-01-01 10:10:01",298049877,[8,9,10,11],"5","8","10","12",{"courseId":13,"courseImg":14,"courseName":15},"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","在测定硫酸锌含量时,以铬黑T作指示剂,pH值应控制为( )",[18,29,38,47,56,65,74,83,92,101],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],298049868,[22,23,24,25],"使用EDTA分析纯试剂先配成近似浓度再标定","标定条件与测定条件应尽可能接近","EDTA标定溶液应贮存于聚乙烯瓶中","标定EDTA溶液须用二甲酚橙指示剂","以下关于EDTA标准溶液制备叙述中不正确的为( )","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],298049869,[33,34,35,36],"MgO","ZnO","ZnO片","Cu片","国家标准规定的标定EDTA标准滴定溶液的基准试剂是( )",{"answer":39,"createTime":5,"id":40,"options":41,"question":46,"source":27,"type":28},[],298049870,[42,43,44,45],"称取乙二胺四乙酸(M=292.2g\u002Fmol)2.9g,溶于500ml水中","称取乙二胺四乙酸2. 9g.加入200水溶解后,定容至500ml","称取二水合乙二胺四乙酸二钠盐(M=372. 2g\u002Fmol)3.7g,溶于500mL水中","称取二水合乙二胺四乙酸二钠盐3.7g,用200ml水溶解后,定容至500mL","在配制0.02mol\u002FL的EDTA标准溶液时,下列说法正确的是( )",{"answer":48,"createTime":5,"id":49,"options":50,"question":55,"source":27,"type":28},[],298049871,[51,52,53,54],"250一270℃","800℃","105―110℃","270~300℃","二级标准氧化锌用前应在( )灼烧至恒重",{"answer":57,"createTime":5,"id":58,"options":59,"question":64,"source":27,"type":28},[],298049872,[60,61,62,63],"1︰1","2︰1","1︰2","4︰1","EDTA与Ca 2+配位时,其配位比为( )",{"answer":66,"createTime":5,"id":67,"options":68,"question":73,"source":27,"type":28},[],298049873,[69,70,71,72],"金属-指示剂配合物","金属-配位剂(EDTA)配合物","游离金属指示剂","配位剂与指示剂配合物的混合物","在直接配位滴定法中,终点溶液一般呈现( )的颜色",{"answer":75,"createTime":5,"id":76,"options":77,"question":82,"source":27,"type":28},[],298049874,[78,79,80,81],"加入盐酸羟胺","加入三乙醇胺","加入氢氧化钠","预先分离","在测定水中Ca 2+、Mg 2+时, Fe 3+、Al 3+对测定有干扰,常采用( )的方法消除此干扰",{"answer":84,"createTime":5,"id":85,"options":86,"question":91,"source":27,"type":28},[],298049875,[87,88,89,90],"易与金属离子形成稳定的配合物","形成的配合物的比例大多数为1:1","在酸度较高的溶液中可形成MHY配合物","酸度越高滴定反应的条件稳定常数越大","以EDTA为配位滴定剂,下列叙述中错误的是( )",{"answer":93,"createTime":5,"id":94,"options":95,"question":100,"source":27,"type":28},[],298049876,[96,97,98,99],"黄色","红色","蓝色","紫色","在测定硫酸锌含量时,以铬黑T为指示剂终点颜色为( )",{"answer":102,"createTime":5,"id":6,"options":103,"question":16,"source":27,"type":28},[],[8,9,10,11]]