SODIUM SULFATE Na2SO4

Properties of sodium sulfate Na2SO4:

Thenardite, Glauber's salt or mirabilite (hydrated). White. Melts and boils without decomposition. Readily soluble in water (without hydrolysis). Participates in the exchange reactions. Reduced with hydrogen, carbon.


Molar mass g/mol 142.04
Density g/cm3 2.66
Melting point °C 884
Boiling point °C 1430
Solubility in water at 20°C g/100g water 19.2

Obtaining sodium sulfate Na2SO4:

2 NaOH + H2SO4 (diluted) = Na2SO4 + H2O

NaOH + H2SO4 (conc., cold) = NaHSO4 + H2O.

NaHSO4 + NaCl = Na2SO4 + HCl (450-800°C).

NaCl (solid) + H2SO4 (conc.) = NaHSO4 + HCl↑ (to 50°C)

2 NaCl (solid) + H2SO4 (conc.) = Na2SO4 + 2HCl↑ (boiling).

Na2S (solid) + 2O2 = Na2SO4 (t> 400°C).

Na2S + 4 H2O2 (conc.) = Na2SO4 + 4H2O.


Reactions with sodium sulfate Na2SO4:

2 (Na2SO4-10H2O) (liquid) = Na2SO4↓ + Na2SO4(saturated) + 20 H2O (at 32,384°C).

Na2SO4 (diluted) + 8H2O = 2 [Na(H2O)4]+ + SO42- (pH = 7).

Na2SO4 (solid) + H2SO4(conc.) = 2 NaHSO4(solution).

Na2SO4 + SO3 = Na2S2O7.

Na2SO4 + 4 H2 = Na2S + 4H2O (550-600°C, catalyst Fe2O3).

Na2SO4 + 2 F2 = 2NaF + SO2F2 + O2 (100-150°C).

Na2SO4 + 2C (coke) + CaCO3 = Na2CO3 + CaS + CO2 (1000°C).

Na2SO4 + BaE2 = BaSO4↓ + 2NaE (E = Cl-, OH-).


 

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