7789-12-0 Usage
Chemical Properties
Orange-yellow powder. Soluble in acids
and hot water; insoluble in alcohol and ether.
Uses
Different sources of media describe the Uses of 7789-12-0 differently. You can refer to the following data:
1. Sodium Dichromate Dihydrate is used as a catalyst in the synthesis of Endoperoxide II. Strong oxidizing agent in organic synthesis. Used in metal finishing as an aid in corrosion resistance.
2. It is used in preparation of titrant in redox titrations.
Definition
A red crystallinesolid, Na2Cr2O7.2H2O, solublein water and insoluble in ethanol. Itis usually known as the dihydrate(r.d. 2.52), which starts to lose waterabove 100°C; the compound decomposesabove 400°C. It is made bymelting chrome iron ore with limeand soda ash and acidification of thechromate thus formed. Sodiumdichromate is cheaper than the correspondingpotassium compound buthas the disadvantage of being hygroscopic.It is used as a mordant in dyeing,as an oxidizing agent in organicchemistry, and in analytical chemistry.
General Description
Solid orange-yellow crystal or powder.
Air & Water Reactions
Water soluble (hot water).
Reactivity Profile
Sodium dichromate dihydrate can react with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers). The products may themselves be capable of further reactions (such as combustion in the air). Reactions may be rapid but often requires initiation (heat, spark, catalyst, addition of a solvent). Can react violently with active metals, cyanides, esters, and thiocyanates.
Hazard
Toxic by ingestion and inhalation.
Health Hazard
INHALATION: Corrosive to mucous membranes continuous exposure may lead to perforation of nasal septum. EYES: Conjunctivitis and lacrimation. SKIN: Corrosive producing deep penetrating ulcers to exposed area. Slow to heal. INGESTION: Has a harsh metallic taste. May cause vertigo, thirst, abdominal pain, vomiting, shock, convulsions and coma.
Purification Methods
Crystallise the dichromate from small volumes of H2O by evaporation to crystallisation. Its solubility in H2O is 238% at 0o and 508% at boiling. The red dihydrate is slowly dehydrated by heating at 100o for long periods. It is deliquescent and is a powerful oxidising agent—do not place it in contact with skin— wash immediately as it is caustic. (Possible carcinogen.) Sodium dihydrogen orthophosphate ( 2 H2O) [13472-35-0 (2H2O), 10049-21-5 (H2O), 7558-80-7 (anhydrous)] M 156.0, m 60o(dec), d 4 1.91. Crystallise it from warm water (0.5mL/g) by chilling.
Check Digit Verification of cas no
The CAS Registry Mumber 7789-12-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 9 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 7789-12:
(6*7)+(5*7)+(4*8)+(3*9)+(2*1)+(1*2)=140
140 % 10 = 0
So 7789-12-0 is a valid CAS Registry Number.
InChI:InChI=1/2Cr.Na.2H2O.7O/h;;;2*1H2;;;;;;;/q;;+1;;;;;;;;2*-1/rCr2O7.Na.2H2O/c3-1(4,5)9-2(6,7)8;;;/h;;2*1H2/q-2;+1;;
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