Chromium nitrate, nonahydrate CAS No: 7789-02-8 Appearance: purple red crystal of monoclinic system Assay ... : 98% min. Chromium nitrate, nonahydrateCAS No: 7789-02-8Molecular Formula: Cr(NO3)3·9H2OAppearance: purple red crystal of ... % min. Insoluble matter in water: 0.02% max. Chloride: 0.01% max. Sulfate: 0.02% max. Al: 0.05% max. ... of ceramics. Chromium nitrate, nonahydrate ( CAS No: 7789-02-8 )