Silver chloride

Summary The goal of the experiment was to determine weight % of sulfate inside an unknown sample compose of Na2SO4. The sample was dried, weighed and dissolved in water and hydrochloric acid. Barium chloride was then added in excess to drive the precipitation process to completion. Heat was use to digest the precipitate before it was filtered through an ashless filter paper and ignited to constant weight. From mass of the sample and mass of the precipitate, the percentage of sulfate in the…

Silver nanoparticles have unique antimicrobial properties. They have a variety of applications: diagnostics, wound healing, pharmaceuticals, etc. These nanoparticles destroy bacterial cells walls and interrupt membrane integrity by their electrostatic attraction to the negatively charged bacterial cell walls [10]. Metal nanoparticles are usually synthesized by chemical techniques which is costly and highly toxic. Currently, there is a growing demand for alternative methods that would limit the…

mostly a physical change but their was a slight chemical reaction because of the acidity of the vinegar. We then heated granular zinc and zinc chloride solution with the penny in a dish on a hot plate until it boiled. We removed the penny with tongs and placed it in a beaker of water, immediately noticing the copper penny was now a bright, metallic silver. Visually it was clear…

start to bubble and producing fumes at the same time with a burning sound. Magnesium start to turn into a white liquid form. After the bubble start to disappear, more Hydrochloric acid was added, and the reactions repeats. Until none of the shiny silver Magnesium ribbon can be seen, and there is no more bubble, the reaction is over. After placing the evaporating dish on a hot plate on a scale of 7, by the data from Data table #2, the white liquid that contains Magnesium, Chlorine and Hydrogen…

Fingerprint Development Techniques Fingerprint development techniques are vital in crime scene analysis, personal identification purposes, and forensic research. There are three different types of fingerprints that are known: patent prints, plastic prints, and latent prints. Patent prints are common and the easiest to locate because they are visible to the naked eye, while plastic prints are also easy to locate, but far less commonly found than patent prints. Latent prints are the most common…

My group had been given a specific task to investigate according to the lab manual1. We were employed by the Environmental Protection Agency as chemists. Our task is to identify an unknown compound that was found in a nearby landfill. In this laboratory, the unknown compound was given to us by our TA. The main goal of this experiment was to correctly identify the unknown compound. We also wanted to discover as many chemical and physical properties as possible. Physical properties are those that…

Through this wet collodion procedure, Archer was able to overcome the flaws in the Calotype process. In this procedure, the light-sensitive material silver halide was applied to the surface of glass plates, making the resolution much higher. Although, it was a tricky process that took a lot of effort and quickness, as collodion is a sticky material and substantiates in the air. Nevertheless, the effort…

Using qualitative analysis, two cations in an unknown solution was identified. After repeated mixing, centrifugation, and decanting, lead was confirmed in Part A and barium in Part B. In Part C, different colored flames of metal species were observed using cation flame tests. Formula unit, total ionic, and net ionic equations were then composed for the identified cations. If the experiment were to be repeated, step 13 could be ommitted as barium was already confirmed in step 12 with the…

This picture contained highlights and shadows with deep contour. Daguerre’s Still Life claimed scientific innovation, although it was astonishingly artistic. Daguerre sensitized the plates by placing the silver side down. The silver box containing iodine was put into the camera obscura. After heated in mercury, bathed and washed, the images became clearer. This produces images in frosted whitish mercury amalgam. With much success, the daguerreotype proved to…

to make prints visible on porous surfaces, forensic scientists use one of three methods; Silver Nitrate, Ninhydrin and Iodine fuming. These three methods are known to be the most effective ways for developing prints. Silver Nitrate is best known for developing prints on porous surfaces. Specimen on these surfaces can either be sprayed by or immersed in a diluted form of Silver Nitrate. Three variants of silver nitrate solution are used, a 1% w/v aqueous solution, a 3% w/v aqueous solution, and…