Sodium Dichromate Dihydrate

【 Molecular formula 】 Na₂Cr₂O₇.2H₂O

【 Molecular weight】 298.02

【 CAS NO.】7789-12-0

【 Character 】 This product is bright orange red monoclinic acicular or small granular crystal. It is easy to deliquesce in air and dissolve in water to form orange solution. Its aqueous solution is acidic. In acidic medium, sodium dichromate is a strong oxidant.

【 Use 】It is mainly used to manufacture chromic anhydride, chrome yellow pigment and other chromium salts. It is also used in tanning, textile, electroplating, medicine, oil, dye, drilling, wood anti-corrosion and other industries.

【 Package】40kg high-strength composite bag or plastic woven bag lined with plastic bag.

【 Notes 】Do not mix with food or strong reducing agent; During storage and transportation, pay attention to moisture-proof, heat proof, shock proof and keep away from inflammables.

【 Executive criteria】 GB/T1611-2014

Indication name	Index (%)
Indication name	Superior products (%)	First class (%)	Qualified products (%)
Chromic anhydride (CrO3)	≥99.8%	≥99.6%	≥99.2%
Sulfate (SO₄^2-)	≤0.05%	≤0.10%	≤0.20%
Sodium (Na)	≤0.04%	/	/
Turbidity (NTU)	≤5%	≤15%	/
Water insoluble matter	≤0.01%	≤0.03%	≤0.05%

Properties

Sodium dichromate is an inorganic compound, commonly known as sodium alum, orange crystal, which is often used in the form of dihydrate: sodium dichromate dihydrate. Its chemical properties are similar to that of potassium dichromate. The solubility of sodium dichromate in water is about 20 times that of potassium dichromate (49G / L, 0 ° C), and its relative molecular weight is smaller. However, its application is not as wide as that of potassium dichromate. Chromium in sodium dichromate is hexavalent, harmful and carcinogenic. Anhydrous sodium dichromate is highly toxic.

CAS No.

7789-12-0

Formula

Cr2H4Na2O9

Molecular Mass

297.99800

Exact Mass

297.84600

PSA

142.09000

Logp

-0.90980