Sodium dichromate

 

Sodium dichromate

Chemical formula	Na2Cr2O7
OTP appearance	bright orange crystals
Molar Mass(g/mol)	261.97
Density(g/cc)	2.52
Melting Point(°C)	356.7
Boiling Point(°C)	400(decomp)
Solubility in water(g/L)	730
NFPA 704	0 3 0 ox

Uses

Justification Questioned

Other

• Intermediate in chromium refining
• oxidizing reagent

Hazards

• potential (Chromium VI) carcinogen

Production

Synthesis

carbon dioxide

Bubble carbon dioxide through an aqueous solution of sodium chromate

2 Na₂CrO₄ + 2 CO₂ + H₂O → Na₂Cr₂O₇ + 2 NaHCO₃

sulfuric acid

Combine sulfuric acid and sodium chromate

Na₂CrO₄ + H₂SO₄ → Na₂Cr₂O₇ + 2 NaHSO₄