Natriumdichromat Dihydrat

Bezeichnung:Natriumdichromat Dihydrat

CAS-Nr7789-12-0

Englisch Name:Sodium dichromate dihydrate

CBNumberCB2206099

SummenformelCr2H5NaO8

Molgewicht260.01

MOL-Datei7789-12-0.mol

Synonyma

Natriumdichromat Dihydrat

Natriumdichromat Dihydrat physikalisch-chemischer Eigenschaften

Schmelzpunkt	91 °C(lit.)
Siedepunkt	400°C
Dichte	2,348 g/cm³
Dampfdichte	10 (vs air)
storage temp.	Store at +5°C to +30°C.
Löslichkeit	Methanol (Slightly, Sonicated)
Aggregatzustand	Solid
Wichte	2.348
Farbe	Red-orange
Geruch (Odor)	Odorless
Säure-Base-Indikators(pH-Indikatoren)	3.5-4.0
Wasserlöslichkeit	730 g/L (20 ºC)
Sensitive	Hygroscopic
Merck	14,8609
Dielectric constant	2.9（Ambient）
CAS Datenbank	7789-12-0(CAS DataBase Reference)
EPA chemische Informationen	Disodium dichromate dihydrate (7789-12-0)

Sicherheit

Kennzeichnung gefährlicher	O,T+,N
R-Sätze:	45-46-60-61-8-21-25-26-34-42/43-48/23-50/53
S-Sätze:	53-45-60-61
RIDADR	UN 3086 6.1/PG 1
WGK Germany	3
RTECS-Nr.	HX7750000
TSCA	Yes
HazardClass	5.1
PackingGroup	III
HS Code	28413000

Gefahreninformationscode (GHS)

Sodium dichromate dihydrate Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R45:Kann Krebs erzeugen.
R46:Kann vererbbare Schäden verursachen.
R60:Kann die Fortpflanzungsfähigkeit beeinträchtigen.
R61:Kann das Kind im Mutterleib schädigen.
R8:Feuergefahr bei Berührung mit brennbaren Stoffen.
R21:Gesundheitsschädlich bei Berührung mit der Haut.
R25:Giftig beim Verschlucken.
R26:Sehr giftig beim Einatmen.
R34:Verursacht Verätzungen.
R42/43:Sensibilisierung durch Einatmen und Hautkontakt möglich.
R48/23:Giftig: Gefahr ernster Gesundheitsschäden bei längerer Exposition durch Einatmen.
R50/53:Sehr giftig für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
S-Sätze Betriebsanweisung:
S53:Exposition vermeiden - vor Gebrauch besondere Anweisungen einholen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S60:Dieses Produkt und sein Behälter sind als gefährlicher Abfall zu entsorgen.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
Chemische Eigenschaften
Orange-yellow powder. Soluble in acids and hot water; insoluble in alcohol and ether.
Chemische Eigenschaften
Sodium chromate, including the hexahydrate, is yellow crystalline solids that can also be used in solution. Disodium dichromate (10588-01-9):
Verwenden
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.
Verwenden
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.
Allgemeine Beschreibung
Solid orange-yellow crystal or powder.
Air & Water Reaktionen
Water soluble (hot water).
Reaktivität anzeigen
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.
mögliche Exposition
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.
Versand/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.
läuterung methode
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.
Inkompatibilitäten
Aqueous solution in a base. A strong oxidizer. Violent reaction with reducing agents; combustibles, strong acids; organic materials.

Sodium dichromate dihydrate Upstream-Materialien And Downstream Produkte

7789-12-0, Sodium dichromate dihydrate Verwandte Suche:

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