[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fEcW0ov_uOxpOA_tB1fPMa-YH7gSrhE8453Owp0lEKcU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-05-11 14:51:27",5236214,[8,9,10,11],"不粘玻璃棒","1-2min内漏斗颈无液滴滴下","滤纸压在晶体上,滤纸不湿","以上三点均为标准",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},16,"d09896c5ad993f65417b265dfae45fa3","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4f9e88d7e15b1cd363518329a0b0c43b.jpg","无机及分析化学实验","defdc076411f4acb8cd4cd4f4281645a","粗食盐提纯","晶体表面的液体是否抽干净的标准是( )",[21,32,41,50,60,69,72,81,90,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],5236209,[25,26,27,28],"将 pH 试纸放入待测溶液中润湿后取出,半分钟内与标准比色卡比较","将待测溶液倒在 pH 试纸上,与标准比色卡比较","用干燥洁净的玻璃棒蘸取待测液,滴在 pH 试纸上,立即与标准比色卡比较","将 pH 试纸剪成小块,放在干燥清洁的表面皿上,再用璃棒蘸取少许待测液,滴在 pH试纸上,半分钟内与标准比色卡比较","用 pH 试纸测定某无色溶液的 pH 时,规范的操作是(  )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],5236210,[36,37,38,39],"水浴加热","砂浴加热","马弗炉加热","电热烘箱加热","某制备实验需要控温在110℃,同时进行搅拌,选择的加热方法是( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],5236211,[45,46,47,48],"①②⑦①③⑤④⑥","④②①③⑤⑦①⑥","②①③④①③④⑥","④②①③⑤①⑥","为了精制粗盐(其中含 Ca2+、及泥沙等杂质),可将粗盐溶于水后,进行操作:①常压过滤; ②加适量 1 mol·L-1 NaOH 溶液和饱和 Na2CO3 溶液;③加HCl 溶液中和至 pH 为 4~5; ④减压过滤;⑤蒸发浓缩至晶膜析出、冷却结晶;⑥炒干;⑦检验 Mg2+完全沉淀则最合理的操作步骤是 ( )",{"answer":51,"createTime":52,"id":53,"options":54,"question":59,"source":30,"type":31},[],"2026-03-13 19:18:36",5236212,[55,56,57,58],"检验滤液中是否存在Ca、Mg离子用胶头滴管向试管滴EBT时,滴管尖端与试管内壁接触","普通过滤时,漏斗颈未能紧靠远离烧杯尖嘴处的烧杯壁","减压抽滤时,布氏漏斗的颈尖嘴部分远离抽滤瓶抽气嘴","布氏漏斗中使用的滤纸要与漏斗内径一样大","下列关于NaCl提纯实验操作,正确的是( )",{"answer":61,"createTime":5,"id":62,"options":63,"question":68,"source":30,"type":31},[],5236213,[64,65,66,67],"选择滤纸要小于漏斗1cm左右","滤纸要紧贴漏斗,提高过滤效率","过滤时,每次所加液体液面距离漏斗上沿1cm时,停止加液","过滤结束后,沉淀、滤纸需用少量去离子水清洗干净","关于常压过滤,下列说法不正确的是( )",{"answer":70,"createTime":5,"id":6,"options":71,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":73,"createTime":5,"id":74,"options":75,"question":80,"source":30,"type":31},[],5236215,[76,77,78,79],"真空泵","布氏漏斗","吸滤瓶","以上都是","减压过滤装置包括()",{"answer":82,"createTime":5,"id":83,"options":84,"question":89,"source":30,"type":31},[],5236216,[85,86,87,88],"①→②→③→④→⑥→⑧→⑦→⑨→⑤","①→②→⑤→④→③→⑥→⑦→⑧→⑨","①→④→③→②→⑥→⑦→⑨→⑧→⑤","①→③→②→④→⑨→⑥→⑦→⑧→⑤","正确的抽滤操作顺序是( )①将抽滤瓶用橡皮管连接于真空泵上.②关闭气阀,打开真空泵,开始抽气.③将减压漏斗安装在抽滤瓶上,注意漏斗尖嘴远离抽滤瓶支管.④选择适当大小的滤纸,平铺于布氏漏斗的瓷板上,用去离子水将滤纸润湿.⑤清洗布氏漏斗及抽滤瓶.⑥待滤纸紧贴漏斗底板小孔,用玻璃棒搅动溶液,让液体带出晶体,引流至漏斗中.⑦抽滤至漏斗尖嘴处没有液体下滴.⑧关闭真空泵,拔下抽滤瓶连接的橡胶管.⑨松开气阀,拔下减压漏斗,取出晶体",{"answer":91,"createTime":5,"id":92,"options":93,"question":97,"source":30,"type":31},[],5236217,[94,95,96,79],"滤纸润湿,紧贴漏斗内壁,不残留气泡","滤纸边缘略低于漏斗边缘,液面低于滤纸边缘","倾倒时盛过滤液的烧杯杯口紧靠玻璃棒,玻璃棒下端抵靠在三层滤纸处,漏斗下端长的那侧管口紧靠烧杯内壁","过滤时操作要求"一贴、二低、三靠"指的是( )",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":107},[],5236218,[102,103,104,105],"加热浓缩至液体几乎蒸干时,停止加热","加热时,温度越高,浓缩速度越快,晶体质量越高","加热浓缩至液体表面有晶膜析出,即可停止加热","加热时,温度不宜过高,否则产生爆沸浓缩液体溅出,造成产品损失,或温度过高,晶体失去结晶水","关于浓缩结晶操作,下列说法正确的是( )",1]