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Gaokao Chemistry Practice Question

4. (6 分) 下列实验操作不当的是 ( )

  1. A.用稀硫酸和锌粒制取 $\mathrm{H}_{2}$ 时, 加几滴 $\mathrm{CuSO}_{4}$ 溶液以加快反应速率
  2. B.用标准 $\mathrm{HCl}$ 溶液滴定 $\mathrm{NaHCO}_{3}$ 溶液来测定其浓度，选择酚唒为指示剂
  3. C.用铂丝蘸取某碱金属的盐溶液灼烧, 火焰呈黄色, 证明其中含有 $\mathrm{Na}^{+}$
  4. D.常压蒸馏时, 加人液体的体积不超过圆底烧瓶容积的三分之二

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