试题与答案

(11分)实验室需要0.80 mol/L NaOH溶液475 mL和0.40 m

题型:实验题

题目:

(11分)实验室需要0.80 mol/L NaOH溶液475 mL和0.40 mol/L硫酸溶液500 mL。根据这两种溶液的配制情况回答下列问题:

(1)如图所示的仪器中配制溶液肯定不需要的是           (填序号),配制上述溶液需用到的玻璃仪器除上述列出的仪器和玻璃棒外,还需要用到的玻璃仪器是                         (填仪器名称)。

(2)下列操作中,容量瓶所不具备的功能有        (填序号)。

A.配制一定体积准确浓度的标准溶液

B.量取一定体积的液体

C.测量容量瓶规格以下的任意体积的液体

D.准确稀释某一浓度的溶液E.用来加热溶解固体溶质

(3)根据计算用托盘天平称取NaOH的质量为         g。在实验中其他操作均正确,若定容时俯视视刻度线,则所得溶液浓度        0.8 mol/L(填“大于”、“等于”或“小于”,下同)。若定容时,有少许蒸馏水洒落在容量瓶外,则所得溶液浓度           0.8 mol/L。

(4)根据计算得知,所需质量分数为98%、密度为1.84 g/cm3的浓硫酸的体积为         mL(计算结果保留一位小数)。如果实验室有10 mL、15 mL、20 mL、50 mL量筒,应选用      mL量筒最好。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D, E, F

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