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4.不溶性溴化物的制取。A.取溴化钾溶液或其他溴化物溶液一滴,滴于玻片上,再加硝酸银溶液一滴,混和。观察生成溴化银的沉淀(平衡反应式)。记下其颜色,与氯化银的颜色有无区别?在试管中进行上述实验。先注入几滴溴化物溶液,然后滴加硝酸银溶液,直到沉淀生成为止。Ⅵ.碘的实验。1.碘的升华。取一些碘的结晶,放在直玻管中间或试管中,加热(图37)。观察生成的紫色蒸气,同时
4. Insoluble bromide preparation. A. take a drop of potassium bromide solution or other bromide solution, dropped on a glass slide, plus a drop of silver nitrate solution, mixed. Silver bromide precipitation was observed (equilibrium reaction equation). Make a note of its color, is there any difference with the color of silver chloride? Perform the above experiment in a test tube. First inject a few drops of bromide solution, and then dropwise addition of silver nitrate solution, until the precipitate generated so far. Ⅵ. Iodine experiment. Sublimation of iodine Take some crystals of iodine and place in the middle of a straight glass tube or in a test tube and heat (Figure 37). Observe the resulting purple vapor at the same time