Welcome to LookChem.com Sign In|Join Free
  • or
Home > Products > 7789 > 

7789-09-5

Products Categories

Basic Information
CAS No.: 7789-09-5
Name: Ammonium dichromate
Molecular Structure:
Molecular Structure of 7789-09-5 (Ammonium dichromate)
Formula: Cr2H8N2O7
Molecular Weight: 252.06
Synonyms: Chromicacid, diammonium salt (9CI);Dichromic acid, diammoniumsalt (8CI);Ammonium chromate;Diammonium dichromate;
EINECS: 232-143-1
Density: 2.150 g/cm3
Melting Point: 170 °C (dec.)(lit.)
Solubility: 360 g/L (20 ºC)
Appearance: bright orange-red crystals
Hazard Symbols: ExplosiveE,VeryT+,DangerousN
Risk Codes: 45-46-60-61-2-8-21-25-26-34-42/43-48/23-50/53
Safety: 53-45-60-61
Transport Information: UN 1439 5.1/PG 2
PSA: 124.45000
LogP: -0.24940
  • Display:default sort

    New supplier

This product is a nationally controlled contraband, and the Lookchem platform doesn't provide relevant sales information.

Specification

The Ammonium dichromate with CAS registry number of 7789-09-5 is also called Ammonium bichromate. Its EINECS registry number is 232-143-1. The IUPAC name is diazanium oxido-(oxido(dioxo)chromio)oxy-dioxochromium. In addition, the molecular formula is Cr2H8N2O7 and the molecular weight is 252.06. It is a kind of bright orange-red crystals and belongs to the classes of Industrial/Fine Chemicals and Inorganics.

Physical properties about this chemical are: (1)#H bond acceptors: 7; (2)#H bond donors: 2; (3)#Freely Rotating Bonds: 2; (4)Polar Surface Area: 117.97 Å2; (5)MonoIsotopic Mass: 251.914174; (6)Topological Polar Surface Area: 126; (7)Heavy Atom Count: 11; (8)Complexity: 194; (9)Covalently-Bonded Unit Count: 3.

Preparation of Ammonium dichromate: it can be prepared by chromium trioxide and ammonia water. This chemical is a kind of exothermic reaction. You should control the adding speed of ammonia water. The pH value of the reaction solution should be controlled between 4 to 5. Then after a series of cooling, crystallization and drying you can get the desired product. The equation is as follows: 2CrO3 + 2NH4OH → (NH4)2Cr2O7 + H2O.

Uses of Ammonium dichromate: it is used in pyrotechnics and used as a catalyst and a source of pure nitrogen in the laboratory. In addition, it is also used as a mordant for dyeing pigments, in the manufacturing of alizarin, chrome alum, leather tanning and oil purification.

When you are using this chemical, please be cautious about it as the following:
It has risk of explosion by shock, friction, fire or other sources of ignition. And it contact with combustible material may cause fire. It may cause sensitization by inhalation and skin contact. Besides, it has danger of serious damage to health by prolonged exposure through inhalation. And it is very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. In addition, it may cause cancer and heritable genetic damage. You should avoid exposure - obtain special instruction before use. During using it, in case of accident or if you feel unwell, seek medical advice immediately (show label where possible). This material and/or its container must be disposed of as hazardous waste. Moreover, you should avoid release to the environment. You can refer to special instructions safety data sheet.

You can still convert the following datas into molecular structure:
(1)SMILES: [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O.[NH4+].[NH4+]
(2)InChI: InChI=1/2Cr.2H3N.7O/h;;2*1H3;;;;;;;/q;;;;;;;;;2*-1/p+2/rCr2O7.2H3N/c3-1(4,5)9-2(6,7)8;;/h;2*1H3/q-2;;/p+2
(3)InChIKey: JOSWYUNQBRPBDN-RFRSXZKWAS

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
child LDLo oral 99mg/kg (99mg/kg) GASTROINTESTINAL: OTHER CHANGES

KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)"

BLOOD: CHANGE IN CLOTTING FACTORS
Annals of Emergency Medicine. Vol. 24, Pg. 748, 1994.
guinea pig LDLo subcutaneous 25mg/kg (25mg/kg)   Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975.