氢氧化钡与氯化铵反应实验中结冰成功的关键

对氢氧化钡晶体与氯化铵晶体吸热反应进行实验改进,在反应物中加少量的水,反应小烧杯上面倒扣上一个大一点的烧杯等,使得实验中水结冰成功率高,结冰快,且结冰量增大。结冰水中加入酚酞溶液,结出的冰为红色,既能检验氨的生成,又增添了实验的趣味性。

The Key to Success of Freezing in Reaction of Barium Hydroxide with Ammonium Chloride

This paper improved the endothermic reaction of barium hydroxide crystal and ammonium chloride crystal,a small amount of water was added into the reactant,and a beaker was reversed on the small beaker,in this way,the success rate of freezing was high,the freezing rate was fast,and the amount of ice increased.Phenolphthalein was added into the frozen water to form ice,which could not only test the formation of ammonia,but also increased the interest of the experiment.