I was studying chemical equilibrium and my teacher taught me the law of mass action given by Guldberg and Waage. But is there any proof of this law? I did not find the proof anywhere. I searched all over the internet. The proof is not in my textbooks, not did my teacher tell me anything about the proof. It would be of great help if someone could provide the proof. I just want to know from where the law came as I do not feel satisfied just rote learning a formula and not knowing from where it came.