7789-12-0 Usage
Uses
Used in Organic Synthesis:
Sodium dichromate dihydrate is used as a catalyst in the synthesis of Endoperoxide II and as a strong oxidizing agent in organic synthesis. It facilitates various chemical reactions and improves the efficiency of the synthesis process.
Used in Metal Finishing:
In the metal finishing industry, sodium dichromate dihydrate is used as an aid in corrosion resistance. It helps protect metals from rust and other forms of corrosion, extending the lifespan of metal components and structures.
Used in Analytical Chemistry:
Sodium dichromate dihydrate is employed in the preparation of titrant in redox titrations. It serves as an oxidizing agent to determine the concentration of reducing agents in a solution, which is crucial for various analytical applications.
Used as a Mordant in Dyeing:
In the textile industry, sodium dichromate dihydrate is used as a mordant in dyeing processes. It helps to fix dyes onto fabrics, ensuring colorfastness and improving the overall quality of the dyed material.
Chemical Properties:
Sodium dichromate dihydrate is an orange-yellow powder that is soluble in acids and hot water, but it is insoluble in alcohol and ether. Its strong oxidizing properties make it a versatile compound in various industrial applications.
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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