AR grade Ammonium chromate (NH4)2CrO4
Name: Ammonium chronate
Molecular formula: (NH4)2CrO4
Molecular weight: 152.07
CAS No.: 7788-98-9
Packaging: Cardboard drum: 25KG/drum, 500g/bottle, 1000g/bottle
HazardClass: 5.1
PackingGroup: II
UN: 3805
Descriptions
Properties: Yellow monoclinic crystals. Relative density is 1.91. It begins to decompose when heated to 180°C. It is soluble in cold water, slightly soluble in ammonia and acetone, and insoluble in alcohol. Long-term storage can decompose and release ammonia, partially converting it to ammonium dichromate.
Precautions: Toxic.
Uses: It is primarily used as a mordant, sensitizer in photographic coatings, catalyst, corrosion inhibitor, analytical reagent, and oxidizing agent.
Ammonium chronate Specification
Indicator | Specification | ||
Grade | GR | AR | CP |
Content | ≥99.5% | ≥99.5% | ≥99.0% |
Insoluble Matter in Water | ≤0.002% | ≤0.003% | ≤0.005% |
Chloride | ≤0.0005% | ≤0.001% | ≤0.004% |
Sulfate | ≤0.005% | ≤0.015% | ≤0.05% |
Calcium | ≤0.002% | ≤0.004% | ≤0.01% |
Potassium | ≤0.1% | – | – |
Sodium | ≤0.004% | – | – |
Ammonium Precipitate in Ammonia Water | ≤0.002% | – | – |
