Sodium sulfate

 

Sodium sulfate

Chemical formula	Na2SO4
OTP appearance	white crystals
Molar Mass(g/mol)	142.04
Density(g/cc)	2.664
Melting Point(°C)	884
Boiling Point(°C)	1429
Solubility in water(g/L)	232
NFPA 704	0 1 0
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

• See What links here

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