Answer:
Acids in concentrated form are very dangerous chemicals to work with.
Step-by-step explanation:
One way to identify main ideas is to analyse which ideas in the paragraph are derives from another one, then identity that another one, bigger idea. So, the main idea is the one that generalise all the specific points.
Just, remember that those specific points are written to explain and support the main idea. In this all specific points support that ''Acids in concentrated form are very dangerous chemicals to work with''.