English
EnglishIn the automotive industry, car bodies are immersed in phosphating baths to protect them from corrosion. In aqueous solutions, the main components of which are 𝑍𝑛2+, 𝑀𝑛2+, 𝑁𝑖2+ and phosphate, chemical reactions create a thin layer that significantly slows down corrosion and at the same time makes painting easier. However, before the car bodies enter the paint shop, they have to be rinsed off, which carries heavy metals into the rinsing water. The course carries out the heavy metal hydroxide precipitation in a model experiment on manganese and, after filtering off the mixed precipitate of 𝑀𝑛(𝑂𝐻)2, 𝑀𝑛𝑂(𝑂𝐻), 𝑀𝑛𝑂2 a qualitative negative detection. The background information puts this example into a wider context.
