Sodium sulfate

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Sodium sulfate
Chemical formula Na2SO4
OTP appearance white crystals 
Molar Mass(g/mol) 142.04 
Melting Point(°C) 884 
Boiling Point(°C) 1429 
Density(g/cc) 2.664 
Solubility in water(g/L) 232
NFPA 704
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Thermal decomposition of
sodium sulfate decahydrate
33
decahydrate
33°C
anhydrous

Uses

Primary

  • Intermediate in many other reactions

Secondary

  • Drying agent
  • Thermometer calibration point

Natural occurrence

  • Occurs naturally as mirabilite

Hazards

  • GRAS

Production

Synthesis

from sulfuric acid

Combine sulfuric acid and sodium hydroxide, sodium carbonate, or sodium bicarbonate

H2SO4 + 2 NaOH Na2SO4 + 2 H2O
H2SO4 + Na2CO3 Na2SO4 + H2O + CO2
H2SO4 + 2 NaHCO3 Na2SO4 + 2 H2O + 2 CO2

from sodium bisulfate

Combine sodium bisulfate and sodium chloride in water, producing sodium sulfate and hydrochloric acid

NaHSO4 + NaCl
{
heat}
Na2SO4 + HCl

Purification

Testing

Storage

Dispsal

See Also

References