The Purpose of this lab is to utilize, demonstrate and understand the various techniques and procedures used to gravimetric labs - Gravimetric analysis of a salt Essay introduction. For this particular lab we will utilize our scientific knowledge of related to gravimetric procedures to find the chloride content in an unknown soluble salt. Using our developed knowledge of the conservation of mass, solubility and precipitation it is possible with some degree of error to know the content of chlorine in a particular salt by dissolving it in water, than extracting it through precipitation.
Mesh characteristics Raw materials GVS open mesh fabrics offer you the greatest design flexibility. Raw materials used for the monofilament are polyamide PA6. Mesh opening This is the size micron of any window or opening. The openings are tested by electronic analysis image systems during production.
This is also tested by electronic analysis image systems during production. Thread diameter This is the diameter micron of the filament. It is also tested by electronic analysis image systems during production.
For instance, in a tubular filter, the frame socket, two ribs and top cover made by plastics should be eliminated from the calculations of the device EFA. In mesh filters you should only eliminate the seal area.
Micron Retention The diameter of the largest round particles which can pass through a filter. Since absolute Micron Retention can change during filtration, aperture size can be determined by Bubble Point and Glass Bead Tests methods. Bubble Point Test The pressure required to force air bubbles through a wetted mesh.
These tests are typically performed with water; however, test can be conducted on mesh using test liquids other than water. The BP is an indication of the pore size.
The average size can then be calculated by taking into account surface tension, liquid density, temperature and immersion depth. Glass Bead Test A mixture containing glass beads is passed through the mesh, the diameter of the largest bead passing through is considered as the absolute micron retention.
Filter Efficiency FE This is the quantity of particulate retained compared to the total quantity of particulate to which the filter is challenged. The filter efficiency is determined by a pass test which allows the measurement of the percentage of particles which are removed by the filter.
It is expressed by a beta rating representing the effectiveness of the filter that can be calculated as follows: Nonwoven fabric Filtration media Excellent barrier properties to protect your parts from liquids and dust Nonwovens are typically manufactured by putting fibers together in the form of a sheet or web, and then binding them either mechanically, with an adhesive or thermally.
They have a porous structure throughout the cross-section and are able to remove particulate from liquid or gaseous streams. Typically, nonwoven filtration media are characterized by pores in the range from 1 to micron, by high dirt holding capacity, high flow rates, and low pressure drop.
Nonwoven fabrics are manufactured from many grades of cellulose and most natural and synthetic fibers such as polyester, polypropylene, acrylics, fluoropolymers, polyamide and glass. In the 1 to 20 micron mean flow pore range, the cost of nonwovens are much less than membranes and the dirt holding capacity is generally far superior.
Typical GVS applications include fuel, oil, and air filtration. Advantages of nonwoven fabrics include their versatility, diverse functionality, and low price-performance ratio. Many filtration and separation applications require stiffness, minimal flex, and rigidity or even low stretch.
Therefore, it is evident that filter design engineers make their media selections based on performance trade-offs. This is routinely studied at GVS. Fiber diameters are controllable and measured in microns. Recently nanotechnology permits the preparation of sub-micron diameter polymeric fibers.
Wet-laid filtration media are very regular and are characterized by narrow pore size distribution. Spunbond fabrics serve in applications needing a nominal pore size above 5 micron.
They are not as regular as wet laid materials. Meltblown nonwovens have extremely fine fiber diameters, but are not strong fabrics. They are formed by fibers in the micron diameter size range and are character- ized by lower pore size even micron. Test methods evaluation for nonwoven media Standard Test Dust Natural Arizona ground mineral test dusts are available in the following grades: Beta Ratio Ratio of particles present upstream to particles present downstream the filter.
Dead end filtration The stream to be filtered flows perpendicularly through the filtration media. Depth Filtration The filter captures contaminants on the surface and into the cross-section the porous part of the filter media.
Filter Efficiency Is the percentage of particles of a specific size retained by a filter. It is expressed as the amount of standard test dust required to increase the pressure drop of the filter to a predetermined level, at least 3 times of its initial pressure drop.
Flow Rate The quantity of liquid or gas which flows through the filter at a given temperature and pressure. Frazier Permeability It is the air flow in CFM which passes through one square foot of filtration medium at 0.
Gurley Permeability It is the time required for a fixed volume of air to pass though a filter medium placed within a specific apparatus HEPA An air filter or filtration medium which can reject Gravimetric Analysis of Chloride calculate the masses of silver chloride obtained.
Using the gravimetric factor, calculate the mass of chloride in each sample of unknown and the corresponding mass percent chloride.
If one of the results appears questionable, test it for rejection. The precision of your results should be ppth. Gravimetric Analysis of Chloride in Solution Introduction: The purpose of this lab is use a precipitate reaction of silver ion and chloride ion to find the mass of the precipitate, and then use that data to calculate the chloride content of an unknown water-soluble salt%(10).
appendix) determination of sodium chloride content this method allows the calculation of sodium chloride content, as provided for in section , on the basis ofthe water act, (act 54 of ). A Gravimetric Analysis for Chloride UNKNOWN % Cl-in Unknown* 1 2 3 Average %Cl-s Con.
Int Post Lab Questions: 1. What ions can potentially interfere with this analysis? How would significant amounts of one or more of these contaminants in your sample solution affect the accuracy of your answer?
Explain. Gravimetric Analysis. Instructions: Answer the following questions, based on your knowledge of gravimetric analysis. Certain questions may require the use of a calculator or of solubility tables.
Students gain valuable experience in the process of gravimetric analysis. The lab is free of heavy-metal waste typically generated with most gravimetric analysis labs. .