Nickel bromide (NiBr2) is a chemical compound. It consists of one nickel atom and two bromine atoms. It’s commonly used in various chemical reactions and catalysis processes.
| IUPAC Name | Nickel(II) bromide |
| Molecular Formula | NiBr2 |
| CAS Number | 13462-88-9 |
| Synonyms | Nickel dibromide, Nickel dibromide, Nickelous bromide |
| InChI | InChI=1S/2BrH.Ni/h2*1H;/q;;+2/p-2 |
Nickel Bromide Properties
Nickel Bromide Formula
The chemical formula of nickel dibromide is NiBr2. It consists of one nickel (Ni) atom and two bromine (Br) atoms. This formula represents the ratio of atoms in a molecule of nickel dibromide.
Nickel Bromide Molar Mass
The molar mass of nickel dibromide (NiBr2) is approximately 218.5 g/mol. This value is calculated by summing the atomic masses of one nickel atom and two bromine atoms present in the formula.
Nickel Bromide Boiling Point
Nickel dibromide has a boiling point of around 1,381°C (2,518°F). This temperature represents the point at which nickel dibromide transitions from a liquid to a gaseous state under standard atmospheric pressure.
Nickel Bromide Melting Point
The melting point of nickel dibromide is approximately 963°C (1,765°F). This is the temperature at which solid nickel dibromide changes into a liquid state.
Nickel Bromide Density g/mL
Nickel dibromide has a density of about 5.098 g/mL. This density value refers to the mass of nickel dibromide per unit volume and is often used to characterize its physical properties.
Nickel Bromide Molecular Weight
The molecular weight of nickel dibromide (NiBr2) is approximately 218.5 g/mol. This weight is the sum of the atomic weights of the constituent nickel and bromine atoms in the compound.
Nickel Bromide Structure
Nickel dibromide has a crystalline structure in its solid state. The compound consists of nickel (Ni) cations and bromide (Br-) anions arranged in a lattice pattern. This arrangement gives rise to its distinct physical and chemical properties.
Nickel Bromide Solubility
Nickel dibromide is moderately soluble in water. Its solubility varies with temperature, with higher temperatures generally leading to increased solubility. This property plays a role in its applications in various chemical reactions and processes.
| Appearance | Solid, Crystalline |
| Specific Gravity | ~5.098 g/mL |
| Color | Greenish |
| Odor | Odorless |
| Molar Mass | ~218.5 g/mol |
| Density | ~5.098 g/mL |
| Melting Point | ~963°C (1765°F) |
| Boiling Point | ~1381°C (2518°F) |
| Flash Point | Not applicable |
| Water Solubility | Moderately soluble, varies with temperature |
| Solubility | Soluble in polar solvents |
| Vapour Pressure | Not well-defined |
| Vapour Density | Not well-defined |
| pKa | Not well-defined |
| pH | Neutral |
Nickel Bromide Safety and Hazards
Nickel dibromide poses certain safety hazards that need consideration. Inhalation of its dust or fumes can irritate the respiratory tract and cause coughing and breathing difficulties. Skin contact might lead to skin irritation or allergic reactions. Ingestion can cause gastrointestinal distress. It’s important to handle nickel dibromide with care, using protective equipment such as gloves and goggles. Proper ventilation and personal protective measures are crucial when working with this compound. Emergency procedures, like seeking medical attention for exposure, should be understood. Overall, cautious handling and adherence to safety protocols are vital to minimize risks associated with nickel dibromide.
| Hazard Symbols | Health Hazard |
| Safety Description | Handle with care. Avoid inhalation and skin contact. Use appropriate protective gear. |
| UN IDs | UN3260 (for Nickel dibromide) |
| HS Code | 28275900 (for Nickel dibromide) |
| Hazard Class | 8 (Corrosive substances) |
| Packing Group | II (Moderately hazardous) |
| Toxicity | Moderately toxic if ingested or inhaled. Can cause skin and eye irritation. |
Nickel Bromide Synthesis Methods
Nickel dibromide can be synthesized through various methods. One common approach involves reacting nickel oxide (NiO) or nickel hydroxide (Ni(OH)2) with hydrobromic acid (HBr). This reaction yields nickel dibromide along with water as a byproduct. Another method involves a direct combination of nickel metal with bromine gas (Br2), producing nickel dibromide. Additionally, nickel carbonate (NiCO3) can react with hydrobromic acid to form the bromide compound.
Furthermore, a solution of nickel chloride (NiCl2) can react with an alkali metal bromide, like sodium bromide (NaBr), to precipitate nickel dibromide. In industrial settings, electrolytic processes can also be employed, where nickel is dissolved in hydrobromic acid, followed by electrolysis to deposit nickel dibromide.
These synthesis methods require careful handling due to the corrosive and toxic nature of the involved reagents. Proper safety measures and protective equipment are essential. The choice of method depends on factors such as desired purity, scale of production, and availability of reagents. Understanding these methods aids in producing nickel dibromide for various applications in chemical processes and research.
Nickel Bromide Uses
Nickel dibromide finds versatile applications across several fields due to its unique properties and reactivity. Some notable uses include:
- Catalysis: Nickel dibromide acts as a catalyst in various chemical reactions, including cross-coupling reactions and polymerization processes, enhancing reaction rates and product yields.
- Electroplating: Electroplating processes use nickel deposition on surfaces to offer corrosion resistance and improve durability.
- Pharmaceuticals: Synthesizing pharmaceutical intermediates involves utilizing nickel dibromide, contributing to producing various medicines.
- Photographic Industry: The preparation of solutions for developing and fixing photographic prints involves employing nickel dibromide.
- Organic Synthesis: Organic synthesis employs nickel dibromide as a reactant or catalyst to aid in forming complex organic compounds.
- Laboratory Research: Research laboratories utilize nickel dibromide for facilitating specific chemical reactions, aiding in discovering new compounds.
- Chemical Manufacturing: Nickel dibromide finds application in producing other nickel compounds and chemicals for diverse industrial uses.
- Coordination Chemistry: Nickel dibromide’s coordination properties play a crucial role in studying complex formation in coordination chemistry.
- Material Science: In material science, modifying and enhancing material properties through controlled chemical reactions involves using nickel dibromide.
- Environmental Monitoring: Detecting and quantifying certain substances in environmental samples can be achieved through trace analysis using nickel dibromide.
Nickel dibromide’s adaptability and utility in various sectors highlight its significance in both industrial and research contexts. Its distinctive reactivity and catalytic properties continue to contribute to advancements in chemistry and technology.
Questions:
Q: Is nickel dibromide soluble?
A: Nickel dibromide is moderately soluble in water.
Q: Is nickel dibromide soluble in water?
A: Yes, nickel dibromide is soluble in water to a limited extent.
Q: Is nickel II bromide soluble?
A: Nickel II dibromide is soluble in water.
Q: What is the formula for nickel(II) bromide?
A: The formula for nickel(II) dibromide is NiBr2.
Q: Does nickel (II) acetate + iron (II) bromide have an empirical formula?
A: The empirical formula depends on the reactants; it might not yield a simple empirical formula.
Q: What is nickel III bromide used for?
A: Nickel III dibromide has limited practical use due to its instability and reactivity.
Q: Is nickel II bromide ionic or molecular?
A: Nickel II dibromide is an ionic compound.
Q: What is the use of Nickel Bromide?
A: Nickel dibromide is used in catalysis, electroplating, and organic synthesis.
Q: Does NiBr2 + AgNO3 form a precipitate?
A: Yes, NiBr2 and AgNO3 form a yellow precipitate (AgBr) due to the formation of insoluble silver bromide.
Q: Is NiBr2 soluble in water?
A: Yes, NiBr2 is soluble in water.
Q: Al + NiBr2 → ?
A: Aluminum reacts with NiBr2 to produce aluminum bromide (AlBr3) and Ni metal.
Q: Write a balanced net ionic equation for the reaction of NiBr2(aq) with (NH4)2S(aq).
A: Net ionic equation: Ni2+ + S2- → NiS(s).