Make the equation: Na2O = Na2SO4 = NaOH = Na2SO4 = NaNO3

1) Na2O + SO3 = Na2SO4 (when sodium oxide reacts with sulfur oxide (VI), sodium sulfate is formed);

2) Na2SO4 + Ba (OH) 2 = 2NaOH + BaSO4 (when sodium sulfate interacts with barium hydroxide, sodium hydroxide and barium sulfate are formed);

3) 2NaOH + NiSO4 = Na2SO4 + Ni (OH) 2 (when sodium hydroxide interacts with nickel sulfate, sodium sulfate and nickel hydroxide are formed);

4) Na2SO4 + 2AgNO3 = Ag2SO4 + 2NaNO3 (when sodium sulfate reacts with silver nitrate, silver sulfate and sodium nitrate are formed).



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