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Ammonium Bromide is odourless white crystals or granules which becomes yellow when exposed with air. Ammonium Bromide is the ammonium salt of hydrobromic acid. Let us learn the chemical composition and other details of Ammonium Bromide.
Properties Of Ammonium Bromide
| Chemical formula | NH4Br or BrH4N |
| Molecular weight | 97.943 g/mol |
| Density | 2.429 g/cm3 |
| Crystal structure | Isometric |
| Chemical Names | Ammonii bromidum, ammonium bromatum,ammonium bromide ((NH4)Br) |
| Boiling point | 452 °C |
| Melting point | 235 °C |
Ammonium Bromide Structural Formula
Ammonium Bromide is an ammonium salt formed when ammonium ions react with bromide ions in a 1:1 ratio.
NH3 + HBr → NH4Br
The structural representation of Ammonium Bromide is shown as below.
Use Of Ammonium Bromide
- It is used in photography.
- It is used in fireproofing wood.
- It is used as a corrosive inhibitor
Structural Formula of Ammonium Bromide
Ammonium Bromide is generally an ammonium salt that is formed when an ammonium ion reacts with bromide ion in a ratio of 1:1.
NH3 + HBr → NH4Br
The structural representation of Ammonium Bromide is provided below:
Preparation
Ammonium bromide can be formed by the process of a direct action of the hydrogen bromide on the ammonia. The preparation of the Ammonium bromide can also be done by the process of reacting to the ammonia with iron (II) bromide or iron (III) bromide, which we can attain by passing the aqueous bromine solution over the iron filings.
2 NH3 + FeBr2 + 2 H2O → 2 NH4Br + Fe(OH)2
Reactions
Ammonium bromide is a weak type of acid that has a pKa of ~5 in the water. It is an acid salt. The reason that it is an acid salt is that the ammonium ion hydrolyzes slightly inside the water. Ammonium Bromide is a strong electrolyte when it is present inside the water.
NH4Br(s) → NH4+(aq) + Br−(aq)
The Ammonium bromide gets decomposed to the ammonia and hydrogen bromide when it gets heated at raised temperature levels.
NH4Br → NH3 + HBr
Applications
Ammonium Bromide is useful for the purpose of photography in the films, plates, and papers, in fireproofing of the wooden elements, in the lithography and the process inscription, in the corrosion inhibitors, and in many pharmaceutical preparations done in the labs during the experiments.
Ammonium Bromide is also used in combination with an appropriate oxidizer and it is an efficient biocide that is applied in various water systems in the industrial sector and wastewater to control bacteria, fungi, and the algae.
Characteristics
Some important details related to the ammonium bromide such as chemical formula, molecular weight, density, crystal structure, chemical names, boiling point, and melting point are :
The chemical formula of the ammonium bromide is NH4Br or it can also be called BrH4N. Further, the Molecular weight of the ammonium bromide is 97.943 g/mol. The density of the ammonium bromide is 2.429 g/cm3. The crystal structure of the ammonium bromide is Isometric.
Similarly, some Chemical Names given to the ammonium bromide are Ammonii bromide, Ammonium bromatum, and the Ammonium bromide ((NH4)Br). The Boiling point of the ammonium bromide is near about 452 °C whereas the melting point of the ammonium bromide is 235 °C.
Solubility
In water, the solubility of the ammonium bromide is 78.3 g/100 g water at 25 °C. It is soluble in acetone, ammonia, ether, in water, 97 g/100 cc at 25 °C, 145.6 g/100 cc at 100 °C; in alcohol, 10 g/100 cc at 78 °C. It is freely soluble in the methanol, ethanol, and acetone, slightly soluble in ether and practically insoluble in the ethyl acetate.
Density
The density of the ammonium bromide is 2.429 at 68 °F (USCG, 1999) and 2.429 at 25 °C of temperature level.
Solved Example on Ammonium Bromide Formula
Question: What reaction occurs when we dissolve NH4Br in the water?
- NH4+ + OH- <==> NH4OH
- Br-+ H3O <==> HBr+ H2O
- NH3+H2O <==>NH4+OH
- NH4+H2O <==> NH3+H3O+
- Br– + H2O <==> HBr+ OH–
Solution: NH4Br is the salt of a weak base, NH4OH and a strong acid HBr at the same time, Thus, the NH4+ will hydrolyze as given below:
NH4+ + H2O ==> NH3 + H3O+, so option D is the correct answer.
Can bromine conduct electricity?
Answer:
Bromine is a very poor conductor of electricity. Nonmetals are a bad conductor of electricity. It is relatively uncharged as its electrons are tightly bound toward its nucleus. Therefore it does not have the mobile electrons to conduct electricity.
Is Ammonium Bromide crystalline or amorphous?
Answer:
Ammonium Bromide is the ammonium salt of hydrobromic acid. It is composed of ammonium and bromide ions in a 1:1 ratio. The chemical crystallizes in colorless prisms, processing a saline taste.
What type of intermolecular forces is Ammonium Bromide?
Answer:
Ammonium Bromide is the ammonium salt of hydrobromic acid. It is a strong electrolyte when it is present in the water. It’s decomposed to the ammonia and hydrogen bromide when it gets heated at raised temperature levels.
What are the uses of ammonia?
Answer:
Ammonia is used as a fertilizer in agriculture. It is also used in wastewater treatment, rubber, paper, leather industries and also used in the production of printing as well as cosmetic industries.
Is Ammonium Bromide dissolved in ethanol?
Answer:
Ammonium Bromide is a weak acid. It is freely soluble in the methanol, ethanol, and acetone, slightly soluble in ether, and insoluble in the ethyl acetate.
Is ammonia acidic or base?
Answer:
Ammonia is a weak base because its nitrogen atom has an electron pair that easily accepts a proton but it reacts with water to produce ammonium ions and hydroxide ions.
What are the uses of bromine?
Answer:
Bromine has a large variety of uses such as agricultural chemicals, dyestuffs, insecticides, pharmaceuticals, and chemical intermediates. Its compounds are effective pesticides used both as soil fumigants in agriculture, particularly fruit growing, and as a fumigant to prevent pets from attacking stored grain and other produce.
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