The chemical equation you provided is unbalanced and invalid. This reaction cannot occur under normal conditions, so we cannot provide detailed information, reaction conditions, reaction process, or phenomena that occur. A suitable balanced equation might be: MgSO4 + 2MgCl2 -> 3MgCl2 + SO4^2-. However, this reaction is still not really meaningful because the sulfate ion cannot exist independently and must combine with another ion to form a stable compound.