Make up the reaction equation: Na2O-NaOH-NaHSO4-Na2SO4-SO3

1. Obtaining sodium hydroxide.
Na2O + H2O = 2NaOH.
2. The effect of excess sulfuric acid on alkali – the formation of sodium hydrogen sulfate.
NaOH + H2SO4 = NaHSO4 + H2O.
3. At high temperatures of 450-800 ° C, in reaction with a salt, hydrosulfate transforms into sulfate.
NaHSO4 + NaCl = Na2SO4 + HCl.
4. Reaction with water – release of sulfuric gas.
Na2SO4 + H2O = 2NaOH + SO3.

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