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实验室欲配制0.5mol?L -1 的NaOH溶液500mL有以下仪器：①烧杯②100mL量筒③1 000mL容量瓶④500mL容量瓶⑤玻璃棒⑥托盘天平（带砝码） （1）配制时，必须使用的仪器有（填代号）______， 还缺少的仪器是______ （2）需称量______g烧碱固体，固体应放在______中称量． （3）使用容量瓶前必须进行的一步操作是______． （4）配制时，一般可分为以下几个步骤：①称量②计算③溶解④摇匀⑤转移⑥洗涤⑦⑧冷却．操作顺序为（填代号）______． （5）在配制过程中，其他操作都正确，下列操作不会引起结果偏低的是（填代号）______． ①未洗涤烧杯、玻璃棒 ②未等NaOH溶液冷却至室温就转移到容量瓶中③容量瓶不干燥，含有少量蒸馏水 ④时俯视标线⑤时仰视标线 ⑥NaOH用纸盛装进行称量⑦超过刻度线，吸出一部分水 ⑧摇匀后液面下降，补充水．
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