Write the reaction equation: Na – NaOH – NaHCO3 – Na2CO3 – Na2SO4 – NaCl

1) 2Na + 2H2O = 2NaOH + H2 (when sodium reacts with water, sodium hydroxide and hydrogen are formed);

2) NaOH + H2CO3 = NaHCO3 + H2O (when sodium hydroxide interacts with carbonic acid, sodium bicarbonate and water are formed);

3) 2NaHCO3 = Na2CO3 + CO2 + H2O (when heated, sodium bicarbonate decomposes into sodium carbonate, carbon dioxide and water);

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

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