the mixture is refluxed for 2–3 hours on a hot plate until the unreacted
zinc dust collects in balls. The hot solution is then poured through a fine copper sieve,with stirring, into
30 l. of ice water.
the mixture is refluxed for 2–3 hours on a hot plate until the unreacted zinc dust collects in balls. The hot solution is then poured through a fine copper sieve,with stirring, into 30 l. of ice water.
使混合物在热板上回流2到3个小时直到那些未反应的锌粉熔为球状。然后将（热板上的）热溶液通过铜筛边搅拌边倒入30（公）升的冰水中。
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