Precipitation of nickel (ⅱ) acetate and ferrous bromide
Over the years, scholars have studied the wonders of the combination of various medicinal agents. One day, take nickel (ⅱ) acetate and ferrous bromide, want to see the change of mixing the two.

Nickel (ⅱ) acetate, light in color and pure in quality, quiet in a bottle, like a crystal of repose. Ferrous bromide, also in a unique appearance, is placed on the table. Scholars would like to serve it in utensils, and slowly pour the two into one place.

In Russia, a strange phenomenon is born. In the solution, things gradually separate, and at first it is like a light mist, and then it condenses into particles, and finally it forms a precipitation and settles at the bottom of the vessel. The color and quality of this precipitation are very different from the previous two.

Scholars stared at it and pondered its rationale. Thinking about the formation of this precipitation, it must be due to the combination of two objects and the coordination of ions, so it becomes an insoluble thing. It may have new substances, which is a valuable sign in the field of chemistry.

At that time, although there was no complicated tool to analyze the structure of this precipitation in detail, scholars used their wisdom to slightly deduce its nature. Knowing that the birth of this precipitation is a manifestation of chemical changes, or it can be the foundation of his study and research, open up the road for future generations to explore, and add a wonderful pen to the mystery of chemistry.