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【简答题】
实验室欲用NaOH固体配制1.0mol/L的NaOH溶液480mL： （1）配制时，必须使用到的玻璃仪器有______、______、______、______ （2）使用容量瓶前必须进行的一步操作是______ （3）要完成本实验该同学应称出NaOH______g （4）在配制过程中，其他操作都是正确的，下列操作会引起所配溶液浓度偏高的是______ ①称量固体药品时所用的砝码是生锈的 ②称量时间过长 ③容量瓶不干燥，含有少量蒸馏水 ④俯视刻度线 ⑤未冷却到室温就将溶液转移到容量瓶并 ⑥后塞上瓶塞反复摇匀，静置后，液面低于刻度线，再加水至刻度线．
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