| | Sodium dichromate dihydrate Basic information |
| Product Name: | Sodium dichromate dihydrate | | Synonyms: | SODIUM DICHROMATE 2H2O;SODIUM DICHROMATE-2-HYDRATE;SODIUM DICHROMATE DIHYDRATE;SODIUM DICHROMATE, HYDROUS;SODIUM BICHROMATE DIHYDRATE;SODIUM DICHROMATE, DIHYDRATE REAGENT (ACS);Sodiumdichromatedihydrate,ReagentGrade;chromicacid(h2cr2o7),disodiumsalt,dihydrate | | CAS: | 7789-12-0 | | MF: | Cr2H5NaO8 | | MW: | 260.01 | | EINECS: | 616-541-6 | | Product Categories: | | | Mol File: | 7789-12-0.mol |  |
| | Sodium dichromate dihydrate Chemical Properties |
| Melting point | 91 °C(lit.) | | Boiling point | 400°C | | density | 2,348 g/cm3 | | vapor density | 10 (vs air) | | storage temp. | Store at +5°C to +30°C. | | solubility | Methanol (Slightly, Sonicated) | | form | Solid | | Specific Gravity | 2.348 | | color | Red-orange | | Odor | Odorless | | PH Range | 3.5-4.0 | | Water Solubility | 730 g/L (20 ºC) | | Sensitive | Hygroscopic | | Merck | 14,8609 | | Dielectric constant | 2.9（Ambient） | | CAS DataBase Reference | 7789-12-0(CAS DataBase Reference) | | EPA Substance Registry System | Disodium dichromate dihydrate (7789-12-0) |
| | Sodium dichromate dihydrate Usage And Synthesis |
| Chemical Properties | Sodium chromate, including the hexahydrate, is yellow crystalline solids that can also be used in solution. Disodium dichromate (10588-01-9): | | Chemical Properties | Orange-yellow powder. Soluble in acids
and hot water; insoluble in alcohol and ether. | | Uses | 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. | | Uses | 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. | | Potential Exposure | Used to make dyes, inks, pigments, and other chromates; in leather tanning, a corrosion inhibitor in circulating water systems; metal treatment; a drilling mud additive; chemical intermediate for chromium catalysts; colorimetry, oxidizing agent; bleaching agent; an algicide, fungicide, insecticide; in wood preservation. | | Shipping | UN3087 Oxidizing solid, toxic, n.o.s., Hazard Class: 5.1; Labels: 5.1-Oxidizer, 6.1-Poisonous materials, Technical Name Required. UN3085 Oxidizing solid, corrosive, n.o.s., Hazard Class: 5.1; Labels: 5.1-Oxidizer, 8-Corrosive material, Technical Name Required. | | 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. | | Incompatibilities | Aqueous solution in a base. A strong oxidizer. Violent reaction with reducing agents; combustibles, strong acids; organic materials. |
| | Sodium dichromate dihydrate Preparation Products And Raw materials |
| Raw materials | Sulfuric acid-->Sodium carbonate-->Sodium sulfate-->Aluminum hydroxide-->CALCIUM CARBONATE-->Chromium(III) oxide-->HEAVY CUT RESIDUE OIL-->DOLOMITE-->Dolomite (CaMg(CO3)2), dead-burned refractory-->Chrome iron ore | | Preparation Products | Lead chromate-->Pale chrome yellow-->Sodium chromate tetrahydrate-->Potassium orotate-->1,2,4-Trimethoxybenzene-->Methylene Blue-->Acenaphthenequinone-->Menadione-->Basic chromic sulfate-->Ammonium dichromate-->Methyl 4-aminopyridine-3-carboxylate-->Acid Violet 17-->Pirenoxine-->Chromium sulfate,basic,solid-->Dehydrocholic acid-->Sodium chromate-->TRIMETHYLQUINONE-->Phenanthrenequinone-->6-CARBOXY-2,4-DIHYDROXYPYRIMIDINE MONOSODIUM SALT-->hydrogen [4-[[4-(diethylamino)phenyl][4-[ethyl[(3-sulphonatobenzyl)amino]-o-tolyl]methylene]-3-methylcyclohexa-2,5-dien-1-ylidene](ethyl)(3-sulphonatobenzyl)ammonium, sodium salt-->Chromic chloride hexahydrate-->4-AMINO-1,8-NAPHTHALIMIDE-->1-(2,6-DIMETHYLPHENOXY)ACETONE-->(2,6-DIMETHYLPHENOXY)ACETOXIME-->Strontium chromate-->Probenecid-->Fast Green FCF-->4-Nitro-1,8-Naphthalenedicarboxylic Acid-->water-proofing agnet AC-->LITHIUM DICHROMATE-->4,5-Dichloronaphthalene-1,8-dicarboxylic anhydride-->Pigment Yellow 34-->ACID BLUE 15-->9-Fluorenone-2-carboxylic acid-->sulfomethylated gallnuat sodium tannic acid-->Lemon chrome yellow 501-->acidizig fluid gelling agent CT^{1～6^}-->ChroMiuM(III) sulfate hydrate-->ferric chomium lignin sulfonate |
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