Absorption spectroscopy and acetic acid

Absorption spectroscopy and acetic acid The absorbance of light, wavelength 632nm, was measured in an indicator solution at varying pH, and varying concentration, allowing for a Beer-Lambert plot to be constructed. This was then used to measure acetic acid uptake at the surface of deionised water and octan-1-ol coated water, allowing pH, and hence concentration, to be calculated from absorbance of the liquid. Introduction Surfactants are molecules which are able to form a surface across a liquid, and stop the interaction of foreign molecules with the solution without interacting with these molecules first. These are extremely useful since they often contain a hydrophobic and hydrophilic aspect, which interact differently to different molecules. Surfactants are used in the manufacture of paper, textiles and construction among others.[1] They are the main ingredient of detergents and they allow non-polar molecules to dissolve in polar molecules, such as oil into water. On the surface of the liquid, the surfactant will inter act slightly differently. It will create a surface of hydrophobic ‘tails’. This will stop polar molecules from entering the liquid, since the liquid will appear to be a poor solution for the polar molecule to interact with. They also increase decrease tension of the liquid.[4] This barrier is expected to stop the acetic acid, used in part 3 of the experiment, interacting with the water solvent. If it does interact, the pH of the solution will lower due to acetic acids presence, and the indicator will show a change in colour. If no acetic acid enters the solution, no change should be observed or measured. Experimental Using de-ionised water, a reference light intensity was recorded. A 250ml solution (1) of 0.005% wt bromocresol green was then prepared, and absorbance was measured. 100ml was removed, and the pH adjusted using 0.1M sodium hydroxide and glacial acetic acid, and absorbance was noted at pH’s between 3-6 at 0.3 increments. 50ml of remaining solution (1) was further diluted to solutions of 0.0025%, 0.00125%, 0.000625% and 0.0003125% concentration. Spectroscopic analysis of these concentrations was made, and a Beer Lambert graph plotted. A solution of unknown concentration was then spectroscopically analysed and it’s approximate concentration determined. This solution was then enclosed in a container with acetic acid, and spectroscopic readings taken every 30 seconds. This was repeated with fresh solution, with the addition of 0.2ml of octan-1-ol to the surface of the cuvette. Results The results for the pH change showed a curve, going from lower pH on the left to high pH on the right. This is a more quantifiable way of showing that as the Bromocresol turned blue at higher pH. This shows absorption toward the end of the spectrum of lower energy, (ie higher wavelength). So as pH increased, the absorbance of Bromocresol at 632nm increased too as it became blue. The next aspect of the experiment was to analyse how concentration affected the absorbance of Bromocresol green. As concentration of bromocresol green was altered, it was possible to draw a Beer-Lambert plot detailing how the absorption of the light changed with concentration of the Bromocresol Green. As would be expected, there is a straight line relationship between Bromocresol concentration and Absorbance except at higher concentrations, where the solution plateaus and becomes non-linear. Excluding this end point it is possible to derive the gradient, and hence the value of ?L. This was determined to be 36600.

Analysis and Importance of Peter Voulkos' Work in Ceramics Research Paper

Analysis and Importance of Peter Voulkos' Work in Ceramics - Research Paper Example This discussion will also include an analysis of some of this artists’ work. Biography Peter Voulkos is a well-known ceramic artist who in the 1960s was honored as the leading ceramic artist in California. He is acknowledged for raising ceramics to a higher rank of pensiveness and articulation of a person’s ideas. Peter Voulkos was born by his Greek immigrant parents in the year 1924. He went to school in Montana State University, where he studied painting and ceramics. He also won himself a masters of fine arts degree in California College of the Arts. Production of dinnerware was the first activity he undertook in his ceramics career. He later pioneered a department of art ceramics in Otis College of Art and Design and University of California, Berkeley. In the latter university, he worked until the year 1985 from 1959. His work was influenced by abstract expressionism whereby they renovated traditional ceramics to large scale and non-traditional ceramics (Carasso 56) . Peter Voulkos began his ceramics work in his senior year in the year 1949 at Montana State College. Despite being a ceramic artist, Voulkos also used other materials in his sculptures. He used bronze, and in other cases, he painted his works. Some of the pieces of art he made using bronze casting are Missoula and Bucci. In his later years, Voulkos was initiated into the use of wood-fired to make his sculptures. His work is found in quite a number of museums all around the world such as Museum of Modern Art, found in New York, Kyoto National Museum of Modern Art, found in Japan, Victoria and Albert Museum, in London, and The National Gallery, in Melbourne, Australia among other museums. Voulkos normally did his work in the presence of an audience. This was to help the audience, which was inclusive of other artists, to understand the techniques he used in his work. His work many times comprised of a plate, ice buckets, and stacks with wood firings. Normally, this ceramic artist dest royed other smaller pieces of art then made a new one of a larger scale. Peter Voulkos passed on in the year 2002 due to a heart attack after leading a ceramics workshop at a college in Ohio, Bowling Green State University (Carasso 57). Significance of Peter Voulkos ceramic work Peter Voulkos has been of great importance to the field of ceramics. To begin with, he facilitated the movement of abstract expressionism. This as stated above entailed the transformation of traditional ceramics to non-traditional ceramics. He amongst other artists made use of this movement in their artwork. This enhanced the way in which they expressed themselves. Peter Voulkos made the transition easy by elevating the conservative ceramics above the accepted limits. This formed a platform for abstract expressionism. Through this mode of expression, he managed to be the leading sculptor in the 1960s and created an avenue for California to be a centre for moulding using clay. This show the role he played in improving the use of clay in ceramics. It also illustrates his role in the facilitation of abstract expressionism, which faced challenges then, but currently is being used by many artists. Voulkos also loved working with an audience. This is of great importance since it created a channel through which he could educate his students on how he created his pieces. It also created an avenue for other artists to learn relevant techniques that could assist them in their work. As a result of this,

HUMAN RESOURCES MANAGEMENT-2ND ASSIGNMENT Essay

HUMAN RESOURCES MANAGEMENT-2ND ASSIGNMENT - Essay Example Given the dynamic nature of work that needed to be done, the organization demands high level knowledge and information from the employees. According to the studies made the company has incorporated training and motivational programs for the employees so that they can meet the demand effectively. Conclusion: Thus from the study we can make out that when the company was in danger of losing its market share, the company started focusing on its human resources, which ultimately enabled the company to get back on the track. The company realized the importance of incorporating such policies in their strategic decision making process. Self Evaluation: The presentation provides the highlights of the major aspects that a transport company might consider while designing their Human Resource policy. These policies are uniquely different than the human resource policies which are generally being adapted in manufacturing concerns. Skills along with values constitute the main plan of the entire process of employee development. The service companies specially should consider employees to be the one of the most critical asset component and they should value them accordingly. It should be remembered that with the level of competition present within the industry, the company cannot afford a very liberal payment structure. As with the amount of scope available, any skilled and experienced employee can shift to any other given organization. This would cause a great harm to the parent company not only in qualitative aspects but also in the profit making process. The services provided by all the airlines are similar in nature, so the main part of difference comes in the way the service is being offered to the passengers. The employees who have adequate knowledge and experience can do just that. But with the lack of proper payment structure, frequent shifting of employees may make the continuous process of value creation difficult. It will also dilute the