7785-23-1 Usage
Description
Silver bromide is an inorganic compound with the chemical formula AgBr. It is a light yellowish powder that is photosensitive, meaning it reacts to light exposure. This property makes it a valuable material in various applications, particularly in photography and spectroscopy.
Uses
Used in Photography:
Silver bromide is used as a light-sensitive material in photographic processes. It is the primary halide in silver bromide collodion emulsion negative and silver bromide gelatin emulsion processes, which are essential techniques in the development of photographic films and papers.
Used in Spectroscopic Studies:
Silver bromide is used as a component in the spectroscopic study of silver halides in montmorillonite. This research helps to understand the properties and behavior of silver halides, which have potential applications in various fields.
Used in Antimicrobial Applications:
Silver bromide exhibits antibacterial activity, making it a suitable component for antimicrobial compositions used in wound care products. Its presence in these products helps to prevent infection and promote healing.
Used in Chemical Synthesis:
Silver bromide can be formed by the combination of any soluble bromide with silver nitrate or by exposing metallic silver to the fumes of bromine, as in the daguerreotype process. This synthesis method allows for the production of silver bromide for various applications.
Used in Paper Negative Processes:
Silver bromides were secondary halides for the paper negative processes and albumen negative process, contributing to the development of early photographic techniques.
Used in Wet or Preserved Collodion Processes:
Silver bromides were the primary halides for the wet or preserved collodion processes, which were essential in the production of photographic plates and glass negatives.
Preparation
Silver bromide is prepared by double decomposition reaction. An aqueous solution of alkali bromide, such as sodium or potassium bromide, is slowly added to an aqueous solution of silver nitrate:Ag+ (aq) + Brˉ (aq) → AgBr(s)The precipitate is washed repeatedly with hot water. Preparation should be in a dark room under a ruby red light.
Flammability and Explosibility
Nonflammable
Purification Methods
It is insoluble in dilute HNO3 or dilute NH3 but is soluble in conc NH3. Store it in the dark.
Check Digit Verification of cas no
The CAS Registry Mumber 7785-23-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 5 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 7785-23:
(6*7)+(5*7)+(4*8)+(3*5)+(2*2)+(1*3)=131
131 % 10 = 1
So 7785-23-1 is a valid CAS Registry Number.
InChI:InChI=1/Ag.BrH/h;1H/q+1;/p-1
7785-23-1Relevant articles and documents
Photoelectron spectroscopy of AgCl, AgBr, and AgI vapors
Berkowitz, J.,Batson, C. H.,Goodman, G. L.
, p. 5829 - 5837 (1980)
He I photoelectron spectra of AgCl, AgBr and AgI vapors have been obtained which differ significantly from earlier work.In each instance, the characteristic features of the diatomic molecule are prominent.The spectral features separate into a valence region, predominantly halogen p-like, and a deeper region, predominantly of Ag 4d character.The latter is split by spin-orbit and ligand field interactions, which are parametrized from the experimental data.Relativistic calculations of the Xα-DVM-SCC type have been performed for these species.At the transition statelevel, they agree very well with the experimental peak positions.Nonrelativistic calculations of this type have been performed for CuCl and cyclic Cu3Cl3.Unlike the AgX species, the CuCl and Cu3Cl3 exhibit strong mixing of metal d and halogen p orbitals for the uppermost occupied orbital, and other Cu 3d-like orbitals above the Cl 3p-like orbitals.It is suggested that the occurrence of Cu 3d orbitals in the valence region may play a role in the anomalous diamagnetic signal and large conductivity changes of CuCl condensed from the vapor.
