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Home> Encyclopedia >   /  Halide ( Except Chloride )  /  Other Inorganic Salts  /  Chloride  /  Other Inorganic Chemicals  /  Pharmaceutical Intermediates
Ammonium hydrogen difluoride structure
Ammonium hydrogen difluoride structure

Ammonium hydrogen difluoride

CAS No.:1341-49-7
Molecular Weight:57.043206
Introduction: Ammonium bifluoride solution is the white crystalline solid dissolved in water. Ammonium hydrogen difluoride is corrosive to metals and tissue. Ammonium hydrogen difluoride is used in ceramics.
1. Names and Identifiers
1.1 Name
Ammonium hydrogen difluoride
1.2 Synonyms

Ammonium bifluoride Ammonium bifluoride-crystal AMMoniuM hydrogen difluoride, extra pure, 95% 1KG ammoniumfluoridecompwithhydrogenfluoride(1:1) ammoniumhydrofluoride ammoniumhydrogenbifluoride ETCHING POWDER

1.3 CAS No.
1341-49-7
1.4 EINECS(EC#)
215-676-4
1.5 Molecular Formula
F2H5N (isomer)
1.6 Inchi
InChI=1/2FH.H3N/h2*1H;1H3
1.7 InChkey
KVBCYCWRDBDGBG-UHFFFAOYSA-N
1.8 Canonical Smiles
[NH4+].F.[F-]
2. Properties
3.1 Density
1.52
3.2 Melting Point
125℃
3.3 Boiling Point
230℃
3.4 Vapour
19.4mmHg at 25°C
3.5 Flash Point
240 C
3.6 Appearance
White crystals, Slightly pungent Odor
3.7 Chemical Properties
white scales or flakes, also referred to asammonium hydrogen fluoride, anunonium difluoride and anunonium acid fluoride.
3.8 Color/Form
Rhombic or tetragonal crystals
Orthorhombic crystals
White crystals
3.9 PH
2 (5.7g/l, H2O, 20℃)
3.10 Solubility
630g/l
3.11 Spectral Properties
Index of refraction = 1.390
3.12 Stability
hygroscopic
3.13 StorageTemp
Store at room temperature.
3.14 Water Solubility
41.5g/l00 g Water at 25 C
3. Use and Manufacturing
4.1 Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
4.2 General Description
Ammonium bifluoride solution is the white crystalline solid dissolved in water. Ammonium hydrogen difluoride is corrosive to metals and tissue. Ammonium hydrogen difluoride is used in ceramics.
4.3 Potential Exposure
It is used as a sterilizer, in dairy andbrewery operations; in the ceramic, glass, and electroplatingindustries; as a laundry sour.
4.4 Safety Profile
Caustic poison and strong irritant by all routes. See also HYDROFLUORIC ACID. When heated to decomposition it emits very toxic fumes of F-, NO,, and NH3.
4.5 Shipping
Administer oxygen if breathing is difficult. Remove and isolatecontaminated clothing and shoes. In case of contact withsubstance, immediately flush skin or eyes with runningwater for at least 20 minutes. For minor skin contact, avoidspreading material on unaffected skin. Keep victim warmand quiet. Effects of exposure (inhalation, ingestion or skincontact) to substance may be delayed. Ensure that medicalpersonnel are aware of the material(s) involved and take precautionsto protect themselves. Medical observation isrecommended for 24 to 48 hours after breathing overexposure,as pulmonary edema may be delayed. As first aid forpulmonary edema, a doctor or authorized paramedic mayconsider administering a drug or other inhalation therapy.
4.6 Storage
Hygroscopic. Ambient temperatures.
4.7 Usage
In manufacture of Mg and Mg alloys; in brightening of Al; for purifying and cleansing various parts of beer-dispensing apparatus, tubes, etc., sterilizing dairy and other food equipment; in glass and porcelain industries; as mordant for aluminum; as a "sour" in laundering cloth. In lab production of HF.
4.8 Waste Disposal
May be buried in a speciallydesignated chemical landfill. Aqueous wastes may be reacted with an excess of lime followed by lagooning andeither recovery or land disposal of the separated calciumfluoride. Ammonium hydrogen difluoride Preparation Products And Raw materials Preparation Products
4. Safety and Handling
5.1 Hazard Codes
C
5.1 Risk Statements
R25;R34
5.2 Safety Statements
S22;S26;S37;S45
5.3 HazardClass
8
5.3 PackingGroup
II
5.4 Transport
UN 1727
5.5 Cleanup Methods
Neutralizing agents ... flush with water, rinse with dilute soln of sodium bicarbonate or soda ash.
Environmental considerations- land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. /SRP: If time permits, pits, ponds, lagoons, soak holes, or holding areas should be sealed with an impermeable flexible membrane liner./ Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash or cemented powder. Neutralize with agricultural lime (CaO), crushed limestone (CaCO3) or sodium bicarbonate (NaHCO3). Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water.
Environmental considerations- water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Environmental considerations- air spill: Apply water spray or mist to knock down vapors. Vapor knockdown water is corrosive or toxic and should be diked for containment.
5.6 DisposalMethods
SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.
Waste annoniacal bromate and ammonium bifluoride soln were disposed of by evaporation. No air pollution was observed.
Group III Containers (both combustible and non-combustible) that previously held organic mercury, lead, cadmium, arsenic, or inorganic pesticides should be triple rinsed, punctured and disposed of in a sanitary landfill. Non-rinsed containers should be encapsulated and buried at a specially designated landfill site. /Organic mercury, lead, cadmium, arsenic, or inorganic pesticides/
5.7 DOT Emergency Guidelines
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Health: TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Fire or Explosion: Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Public Safety: CALL Emergency Response Telephone Number ... . 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. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate enclosed areas. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection. Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Evacuation: ... 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. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Fire: Small fires: Dry chemical, CO2 or water spray. Large fires: Dry chemical, CO2, alcohol-resistant foam or water spray. Move containers from fire area if you can do it without risk. Dike fire control water for later disposal; do not scatter the material. Fire involving tanks or car/trailer loads: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Spill or Leak: ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ First Aid: Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. /Ammonium bifluoride, solid; Ammonium bifluoride, solution/
5.8 Exposure Standards and Regulations
Ammonium bifluoride is an indirect food additive for use only as a component of adhesives.
5.9 Fire Fighting Procedures
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
5.10 Formulations/Preparations
Grades or Purity: Pure, 99+%; Technical, 97-98.5%
-10 mesh particle size, 99.9% purity grade; white translucent flake grade; white crystal grades
5.11 Incompatibilities
Incompatible with oxidizers (chlorates,nitrates, peroxides, permanganates, perchlorates, chlorine,bromine, fluorine, etc.); contact may cause fires or explosions.Keep away from alkaline materials, strong bases,strong acids, oxoacids, epoxides. In the presence of moisturecorrodes concrete, metals, glass.
5.12 Other Preventative Measures
Ammonium bifluoride soln should be thoroughly washed from the skin with mildly alkaline soap as soon as possible. ...
If material not involved in fire: Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors. Neutralize spilled material with crushed limestone, soda ash, or lime.
Avoid breathing vapors. Keep upwind. Avoid bodily contact with the material. Do not handle broken packages unless wearing appropriate personal protective equipment. Wash away any material which may have contacted the body with copious amounts of water or soap and water. Avoid breathing fumes from burning material.
SRP: Contaminated protective clothing should be segregated in such a manner so that there is no direct personal contact by personnel who handle, dispose, or clean the clothing. Quality assurance to ascertain the completeness of the cleaning procedures should be implemented before the decontaminated protective clothing is returned for reuse by the workers.
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
5.13 Protective Equipment and Clothing
Wear rubber overclothing, Bureau of Mines approved respirator; rubber gloves; safety goggles
Wear positive pressure self-contained breathing apparatus. Wear appropriate chemical protective ... boots ... If contact with material anticipated, wear appropriate chemical protective clothing.
5.14 Reactivities and Incompatibilities
... Reacts with silicon containing materials like glass or ceramics at room temperature (formation of SiF4). It also reacts with concentrated acids (formation of HF) and concentrated alkaline solutions (formation of NH3).
5.15 Sensitive
Hygroscopic
5.16 Skin, Eye, and Respiratory Irritations
Inhalation of dust may cause irritation of the resp system.
Contact with dust irritates eyes ...
5. MSDS

2.Hazard identification

2.1 Classification of the substance or mixture

Acute toxicity - Oral, Category 3

Skin corrosion, Category 1B

2.2 GHS label elements, including precautionary statements

Pictogram(s)
Signal word

Danger

Hazard statement(s)

H301 Toxic if swallowed

H314 Causes severe skin burns and eye damage

Precautionary statement(s)
Prevention

P264 Wash ... thoroughly after handling.

P270 Do not eat, drink or smoke when using this product.

P260 Do not breathe dust/fume/gas/mist/vapours/spray.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

Response

P301+P310 IF SWALLOWED: Immediately call a POISON CENTER/doctor/\u2026

P321 Specific treatment (see ... on this label).

P330 Rinse mouth.

P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.

P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water [or shower].

P363 Wash contaminated clothing before reuse.

P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.

P310 Immediately call a POISON CENTER/doctor/\u2026

P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Storage

P405 Store locked up.

Disposal

P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification

none

6. Computational chemical data
  • Molecular Weight:57.043206g/mol
  • Molecular Formula:F2H5N
  • Exact Mass:57.039006
  • Monoisotopic Mass:57.039006
  • Complexity:0
  • Rotatable Bond Count:0
  • Hydrogen Bond Donor Count:2
  • Hydrogen Bond Acceptor Count:2
  • Topological Polar Surface Area:1
  • Heavy Atom Count:3
  • Defined Atom Stereocenter Count:0
  • Undefined Atom Stereocenter Count:0
  • Defined Bond Stereocenter Count:0
  • Undefined Bond Stereocenter Count:0
  • Isotope Atom Count:0
  • Covalently-Bonded Unit Count:3
7. Question & Answer
  • At low concentrations of aqueous N H X 4 H F X 2 N H X 4 H F X 2 ( w = 1 – 2 % ) ( w = 1 – 2 % ) p H ≈ 3. p H ≈ 3. But aqueous N H X 4 F N H X 4 F ( w = 20 – 40 % ) ( w = 20 – 40 % ) has p H ≈ 7. p H ≈ 7. Yet the equilibria of H F ? H X + + F X ? K = 6.85 × 10 ? 6 M H F + F X ? ? H F X 2 X...
  • When brass solution (mixed with nitric acid and urea) is to be estimated for amount of copper present, ammonia is added to neutralize the solution. This gives a turbidity which can be dissolve by adding ammonium bifluoride (NH4HF2). What exactly causes the turbidity? Which compound formation is res...
  • Ammonium bifluoride or ammonium hydrogen fluoride is a salt of a weak base and a weak acid. The weak acid is because the second equilibria of H F written as: H F + F X ? ? ? ? ? H F X 2 X ? and it has constant of 3.963 M . But does the bifluoride anion further dissociate? H F in water has many spec...
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