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Silver oxide (Ag2O)

Silver oxide (Ag2O) structure

CAS No:
20667-12-3
Formula:
Ag2O
Chemical Name:
Silver oxide (Ag2O)
Synonyms:
Silver oxide (Ag2O);Disilver oxide;Silver oxide;Silver(I) oxide;Argentous oxide;Disilver monoxide;CF 01;HL 000101;1302-04-1
Categories:
Cosmetic Ingredient > Antimicrobials

Description

Silver(I) oxide, Ag2O, is made by action of oxygen under pressure on silver at 300 °C, or by precipitation of a silver salt with carbonate-free alkali metal hydroxide; it is covalent, each silver atom (in solid Ag2O) having two collinear bonds and each oxygen atom four tetrahedral ones; two such interpenetrating lattices constitute the structure. Dark-brown or black powder; odorless; metallic taste.Soluble in ammonium hydroxide, potassium cyanide solu- tion, nitric acid, and sodium thiosulfate

Silver oxide is an odorless brown-black solid. Sinks in water. (USCG, 1999)|DryPowder

Silver oxide is an odorless brown-black solid. Sinks in water. (USCG, 1999)

Silver oxide (Ag2O) Basic Attributes

Molecular Weight：

231.74

Exact Mass：

229.805099

EC Number：

243-957-1

UN Number：

3085

HScode：

28432900

Characteristics

PSA：

9.23000

XLogP3：

-0.06840

Appearance：

Dark-brown Powder/Solid

Density：

7,143 g/cm3

Melting Point：

300°C(dec.)

Water Solubility：

H2O: slightly soluble

Storage Conditions：

Store at RT.

Toxicity：

Oral-rat LD50:2820 mg/kg; Oral-Mouse LD50:1027 mg/kg

Flammability characteristics：

Light decomposes oxygen, flammable in case of oxide

Air and Water Reactions：

No rapid reaction with air. No rapid reaction with water.

Reactive Group：

Metals, Less Reactive

Reactivity Profile：

Hydrogen sulfide is rapidly oxidized and may ignite in contact with SILVER OXIDE [Bretherick 1979 p. 977]; Mixtures of metal sulfides, gold(III) sulfide, antimony sulfide or mercury (II) sulfide, phosphorus, sulfur, selenium, and selenium disulfide ignite on grinding with the oxide. Ammonia or hydrazine slowly react with silver oxide forming silver nitride or in the presence of alcohol, silver fulminate may also be produced [Bretherick 1979 p. 203]. Oxidation of magnesium is explosive when warmed with silver oxide.

Safety Information

Packing level：

Hazard category：

5.1

Transport codes：

UN 1479 5.1/PG 2

wgk germany：

hazard class code：

36/37/38-8-34-50/53-41

safety instructions：

17-26-36-45-36/37/39-61-60-39

RTECS Number：

VW4900000

Marks：

O,Xi,C,N

Storage features：

The warehouse is ventilated, low temperature and dry; stored separately from fuel, organic matter, easy oxides, sulfur and phosphorus

Explosive characteristics：

Mixed with organic matter and easily oxidized and explosive

Stability/Shelf Life：

Stable. Oxidiser. Incompatible with most common metals, ammonia, magnesium, many organic materials.

Precautionary statement(s)：

P220-P273-P280-P305 + P351 + P338-P501

Hazard Statements：

H271-H318-H410

Fire Hazards：

Behavior in Fire: Decomposes into metallic silver and oxygen. If large quantities are involved, the oxygen might increase the intensity of the fire. (USCG, 1999)

GHS Classification：

|Danger|H271 (67.72%): May cause fire or explosion; strong Oxidizer [Danger Oxidizing liquids; Oxidizing solids]|P210, P220, P221, P261, P264, P271, P273, P280, P283, P302+P352, P304+P340, P305+P351+P338, P306+P360, P310, P312, P321, P332+P313, P337+P313, P362, P370+P378, P371+P380+P375, P391, P403+P233, P405, and P501|Aggregated GHS information provided by 349 companies from 19 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Fire Fighting：

Excerpt from ERG Guide 140 [Oxidizers]: SMALL FIRE: Use water. Do not use dry chemicals or foams. CO2 or Halon® may provide limited control. LARGE FIRE: Flood fire area with water from a distance. Do not move cargo or vehicle if cargo has been exposed to heat. Move containers from fire area if you can do it without risk. FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. ALWAYS stay away from tanks engulfed in fire. For massive fire, use unmanned hose holders or monitor nozzles; if this is impossible, withdraw from area and let fire burn. (ERG, 2016)

Isolation and Evacuation：

Excerpt from ERG Guide 140 [Oxidizers]: As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. LARGE SPILL: Consider initial downwind evacuation for at least 100 meters (330 feet). FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2016)

Nonfire Spill Response：

Excerpt from ERG Guide 140 [Oxidizers]: Keep combustibles (wood, paper, oil, etc.) away from spilled material. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Do not get water inside containers. SMALL DRY SPILL: With clean shovel, place material into clean, dry container and cover loosely; move containers from spill area. SMALL LIQUID SPILL: Use a non-combustible material like vermiculite or sand to soak up the product and place into a container for later disposal. LARGE SPILL: Dike far ahead of liquid spill for later disposal. Following product recovery, flush area with water. (ERG, 2016)

Personal Protective Equipment：

Dust mask; goggles or face shield; protective gloves (USCG, 1999)

Toxicity

Toxicity class：

practically nontoxic

Drug Information

MeSH：

Substances that prevent infectious agents or organisms from spreading or kill infectious agents in order to prevent the spread of infection. (See all compounds classified as Anti-Infective Agents.)

Health Hazards：

Contact with eyes causes mild irritation. If continued for a long period, ingestion or inhalation of silver compounds can cause permanent discoloration of the skin (argyria). (USCG, 1999)

First Aid：

EYES: flush with water. SKIN: flush with water; wash with soap and water. (USCG, 1999)

MeSH Entry Terms：

AG2O

Silver oxide (Ag2O) Use and Manufacturing

Methods of Manufacturing

The silver nitrate method reacts the silver nitrate solution with the sodium hydroxide solution, and the resulting silver oxide is washed, separated, and dried to obtain a finished product. The reaction formula is: 2AgNO3+2NaOH→Ag2O+2NANO3+H2O

Uses

As catalyst; in the purification of drinking water; in the glass industry (polishing, coloring glass yellow).

Processing aids, not otherwise listed

Metal products not covered elsewhere

Production

1,000,000 - 10,000,000 lb

Manufacturing Info：

Organic fiber manufacturing|Silver oxide (Ag2O): ACTIVE

Computed Properties

Molecular Weight:233.752
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:1
Exact Mass:233.82041
Monoisotopic Mass:231.82075
Topological Polar Surface Area:1
Heavy Atom Count:3
Complexity:2.8
Covalently-Bonded Unit Count:3
Compound Is Canonicalized:Yes

Material

Sodium hydroxide

Phosphonic acid

Phosphoric acid

Nitric acid

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