试题与答案

(9分)(1)某实验需要用1.0mol·L-1 NaOH 溶液450mL。配制该

题型:填空题

题目:

(9分)(1)某实验需要用1.0mol·L-1 NaOH 溶液450mL。配制该溶液所需要的玻璃仪器有                                                                   

(2)配制实验操作步骤有:a.在天平上称量       g NaOH固体放入烧杯中,加水溶解,冷却至室温。b.把制得的溶液小心地注入一定容积容量瓶中。c.继续向容量瓶中加水至距刻度线1cm~2cm处,改用胶头滴管加水至刻度线。d.用少量水洗涤烧杯和玻璃棒2~3次,每次将洗涤液转入容量瓶,并摇匀。e.将容量瓶塞塞紧,充分摇匀。填写下列空白:

①操作步骤和正确顺序为            

②该配制过程中两次用到玻璃棒,其作用分别是                           

③定容时,若俯视凹液面,会使结果           (填“偏高”、“偏低”或“无影响”)

④若没有进行d步操作,会使结果            (填“偏高”、“偏低”或“无影响”)

⑤在进行b步操作时,不慎有液体溅出,下列处理措施正确的是(  )

A.继续进行实验

B.添加部分NaOH溶液

C.倒掉溶液,重新配制

D.倒掉溶液,洗净容量瓶后重新配制

答案:

(9份)(1)500mL 容量瓶 烧杯 玻璃棒 胶头滴管 (2分)

(2)(每空1分)20.0 ① a b dc e ②搅拌加速溶解 引流 ③偏高 偏低 D

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