Make up the reaction equation: NaCl- Na- NaOH- Na2Co3- Na2SO4- NaCl

1) 2NaCl = 2Na + Cl2 (during electrolysis, sodium chloride decomposes into sodium and chlorine);

2) 2Na + 2H2O = 2NaOH + H2 (when sodium interacts with water, sodium hydroxide and hydrogen are formed);

3) 2NaOH + H2CO3 = Na2CO3 + 2H2O (when sodium hydroxide interacts with carbonic acid, sodium carbonate and water are formed);

4) Na2CO3 + CaSO4 = Na2SO4 + CaCO3 (when sodium carbonate interacts with calcium sulfate, sodium sulfate and calcium carbonate are formed);

5) Na2SO4 + BaCl2 = 2NaCl + BaSO4 (when sodium sulfate reacts with barium chloride, sodium chloride and barium sulfate are formed).