Na=>NaCl=>HCl=>MgCl=>AgCl
2Na + Cl2 -> 2NaCl 2NaCl + H2SO4 -> Na2SO4 + 2HCl 2HCl + Mg -> MgCl2 + H2 MgCl2 + 2AgNO3 -> 2AgCl + Mg(NO3)2