Saturday, January 25, 2020
Vitamin C Determination By Iodine Titration Biology Essay
Vitamin C Determination By Iodine Titration Biology Essay Vitamin C is also known as ascorbic acid, it is an antioxidant that is essential for human nutrition. Antioxidants help to reduce the damage to the body caused by toxic chemicals and pollutants. Vitamin C is a water-soluble vitamin meaning that it dissolves in water, it is essential for growth and repair of all body tissues. Collagen is an important protein that is used to make skin, scar tissue, tendons, ligaments and blood vessels. Vitamin C is essential to form this and is also required to cure wounds, repair and maintain cartilage, bones and teeth. The body does not store vitamin C and cannot make it by itself, therefore it is important for lots of vitamin C-containing foods to be included in the diet. Excellent sources of vitamin C are: green peppers, citrus fruits, strawberries, broccoli, papaya, watermelon and cauliflower. Vitamin C deficiency can lead to many problems in the body including: dry and splitting hair, bleeding gums, easy bruising, anemia and nosebleeds with one o f the most serious being scurvy. Eating a balanced diet is the best way to get the daily requirements of vitamin C and other essential vitamins. The Food and Nutrition Board at the Institute of Medicine recommends the following amounts of vitamin C: Infants and Children 0 6 months: 40 milligrams/day (mg/day) 7 12 months: 50 mg/day 1 3 years: 15 mg/day 4 8 years: 25 mg/day 9 13 years: 45 mg/day Adolescents Girls 14 18 years: 65 mg/day Boys 14 18 years: 75 mg/day Adults Men age 19 and older: 90 mg/day Women age 19 year and older: 75 mg/day One way to establish the amount of vitamin C in food is to use a redox titration. The redox reaction is better than an acid-base titration since there are additional acids in a juice, but few of them interfere with the oxidation of ascorbic acid by iodine. Iodine is relatively insoluble, but this can be improved by complexing the iodine with iodide to form triiodide: I2 + I- I3- Triiodide oxidizes vitamin C to form dehydroascorbic acid: C6H8O6 + I3- + H2O > C6H6O6 + 3I- + 2H+ As long as vitamin C is present in the solution, the triiodide is converted to the iodide ion very quickly. However, when the all the vitamin C is oxidized, iodine and triiodide will be present, which react with starch to form a blue-black complex. The blue-black colour is the endpoint of the titration. Vitamin C Ascorbic Acid Method The 1% starch solution, iodine solution and vitamin C solution were made up by the technicians. The solutions were standardised before the unknown samples were titrated using the following method: 25.00 ml of vitamin C standard solution was added to a 125ml Erlenmeyer flask 10 drops of 1% starch solution were added to the flask The burette was rinsed with a small volume of the iodine solution and then filled, the initial volume was recorded. The solution was titrated until the end point was reached The final volume of the iodine solution was recorded The titration was completed twice more. Samples of red pepper juice, apple juice and vinegar were then titrated in the same way. This is an example of a titration: Results Sample Your Hypothesis: high medium or low Vitamin C content? Titration 1 Titration 2 Titration 3 Calculated Vitamin C content (g/l) Your result versus the Hypothesis Red Pepper Juice High Vitamin C content 16.0 17.0 18.0 28.5 Correct Apple Juice Medium Vitamin C content 4.0 4.0 4.0 6.8 Correct Vinegar Low Vitamin C content 0.4 0.2 0.4 0.67 Correct Analysis The ml of titrant used for each flask is calculated using: Average volume = total volume number of trials The amount of vitamin C in the samples are calculated using: V itamin C titrant = Titrant used in Sample Standard of Vitamin C unknown Red Pepper Juice       Titrant                      =       Used Sample         Standard of Vitamin C          Unknown Vitamin C    14.9ml        =    17  0.025g/ml              P 596 = 17.0             P P= 17.0                     P= 0.0285g/ml      596 Litres = 0.0285 x 1000          = 28.5g/litre Apple Juice       Titrant                      =       Used Sample         Standard of Vitamin C          Unknown Vitamin C    14.9ml        =    4.0   0.025g/ml              A 596 = 4.0            A A= 4.0                     A= 0.0067 g/ml      596 Litres = 0.0067 x 1000          = 6.8g/litre Vinegar       Titrant                      =       Used Sample         Standard of Vitamin C          Unknown Vitamin C    14.9ml        =    0.4   0.025g/ml             G 596 = 0.4           G G= 0.4                       G= 0.00067g/ml      596 Litres = 0.00067 x 1000          = 0.67g/litre Discussion One of the main problems when completing this experiment is that the concentration of solution was unknown as it was prepared by the technician, the concentration was too high so had to be diluted. The hypothesis was correct in that the red pepper juice had the highest vitamin C content, vinegar the lowest and apple juice medium. Many safety procedures were carried out during the experiment; safety glasses, gloves and goggles were worn, all bags and jackets were in the lockers and chairs were tucked under the desk. There was a good experience with the number of people in the group as it gave everyone a chance to be involved with the experiment. A reading was taken at the first point when the colour started to change and it could be seen easily when it was complete as the change happened gradually. Two examples of other food that are rich in vitamin C that were not tested are tomatoes and raspberries. Iron increases the absorption of vitamin C in the human body, iron is important as i t is used by the body in the production of red blood cells, it is specifically used in the production of hemoglobin which is the main protein in red blood cells. Polyphenol oxidase, also known as tyrosinase, is an enzyme contained in fruits and vegetables such as apples, pears, potatoes, and other starchy foods. When oxygen comes in to contact with the enzyme it causes the fruit to turn brown. Vitamin C has many functions in the body, it is essential for growth and repair of all body tissues. Collagen is an important protein that is used to make skin, scar tissue, tendons, ligaments and blood vessels. Vitamin C is essential to form this and is also required to cure wounds, repair and maintain cartilage, bones and teeth. Anti-oxidant vitamins are Vitamins that help the body in cleansing itself from waste and radical free agents, Free radicals are atoms or groups of atoms with an (unpaired) number of electrons and can be formed when oxygen interacts with certain molecules. As well as vitamin C, vitamins A and E are also antioxidants. Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucous membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye. Vitamin E is important in the formation of red blood cells and can help the body to use vitamin K. Selenium is an essential trace mineral that works strongly with vitamin E to provide the body with powerful antioxidant protection from the free radicals that may add to the development of cancer, heart disease, and arthritis. Selenium protects the body from free radical damage in two ways: It is included into proteins to make selenoproteins, which are important antioxidant enzymes, and it helps the body manufacture its own natural antioxidant, glutathione. Conclusion In conclusion, the experiment worked well as the amount of vitamin C in the samples was established and the results were accurate and as expected.
Friday, January 17, 2020
‘Coming Home’ by Marjorie Waters Essay
‘Coming Home’ by Marjorie Waters is a personal essay which describes the author’s feelings upon returning home after a long time and how she recovers from her deep grief caused by losing a loved one to death. The author narrates how she walks around the house, pulling back the curtains, dusting the dirt off, making tea etc., doing chores that make her feel at home again. Simultaneously, she is opening the doors of her soul to freshen it with the feeling of ‘coming back to home’, to finally realise that the bad phase doesn’t last forever. The author begins by writing ‘After the cruelest of winters, the house still stood’. Literally, this line reflects the entire essence of this essay. She makes an analogy between coming home and the end of her grief. She writes about how surprised she is to see her house in a good condition in spite of the havoc wreaked upon it by the wilderness of the nature. Though there were a few breakages here and there, it still stood firmly. Similarly, there too had been a wild ‘winter’ in her life, the death of a beloved one that had broken her from the inside. Homecoming, after a long time, was the end of her grief. She goes in the rooms, pulls back the curtain so that the daylight drives away the long lingering darkness that there was, as the dust particles shimmer in the light and settle back again. During the night, she makes for herself a cup of tea, and reminisces about the sudden and tragic death of her beloved one, which had almost completely destroyed her zest for life. She thinks about what the passers-by, obviously the neighbours, would say when they look at the house, the windows of which now are open and the light in the rooms now illuminates the house. Her return to her place would be known. She reminisces about the dark time period in her life which had left her lurking in the past, which had cut her loose from everything that made her feel at home. She was caught in her ‘own cold storm’. When people came to offer her condolences, they would only talk about the burden of loss but actually, all she felt was ‘weightlessness’. She felt that the world had pushed her away, the distance she would never be able to cover. But the winter had passed and so had her grief. The author writes, ‘I had feared that, in my absence, the space that I had left behind would close over from misuse’. She implies that she had been afraid that this tragedy might cause such melancholy that she would never be able to come out of it, just like she feared that the gruesome winters would destroy the house. But the house had survived and she too had managed to pull out the strength in her and face the reality. She revives with a new enigma of hope that life will get better, that the grief will not always let the sadness prevail. According to me, the title of the lesson is very much appropriate. She equates the harsh season of the winters to the tragedy that occurred in her life. By ‘coming home’, she hasn’t just come back to a place where she once lived, she has come back to herself, to realise that the ‘winter’ of her life is gone. The grief could no longer sustain, and she had come out if it. She had finally come home, and come back to herself.
Thursday, January 9, 2020
Durkheim And Marx s Theory Of Sociology - 1722 Words
Sociology is a study of society. During the industrialization period Marx and then Durkheim began to apply their sociological theories to explain how societies function. Durkheim and Marx approached sociology from very different perspectives. Durkheim argued that the purpose of sociology is to study how the societal norms and social facts affect people on the individual level. He believed that society is â€Å"sui generis†(Durkheim 1912:247), meaning it is a unique thing that exists on its own. However, Marx approached sociology from an economic perspective. Marx viewed society as a capitalistic system. He categorized society into two groups: proletarians and bourgeoisie. These two groups are always in conflict with each other over the needed resources. Both Durkheim and Marx provide us with a basic understanding of sociological theories that help us examine and analyze societies on micro and macro levels. Marx’s ideas help us understand how the division of labor alien ates workers from their jobs based on the principles of a capitalist system, whereas Durkheim argues that division of labor is needed to improve the overall organic solidarity of the society. Durkheim’s approach to sociology is based on three ideas: positivism, evolutionism, and functionalism. Durkheim was influenced by Auguste Comte’s ideas about positivism. Comte argued that it is possible to study society through the application of scientific method and social laws. In The Rules of Sociological Method,Show MoreRelatedKarl Marx, Emile Durkheim And Max Webers Influence On Religion1727 Words  | 7 PagesThree theorists, Karl Marx, Emile Durkheim and Max Weber, are undoubtedly the fathers of modern sociology. â€Å"Nineteenth century Western Europe was pounded by pivotal forces of transformation. 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Wednesday, January 1, 2020
Franklin Roosevelt And The Making Of Modern America
the book, Franklin D. Roosevelt and the Making of Modern America, the entire life of Franklin Delano Roosevelt (FDR) is told. This book includes all aspects of the former democratic Presidents life, from his parent’s life, his education, his life before presidency, his time in office, and his death. James Roosevelt s father Isaac, became wealthy through trading real estate, dried goods, and West Indian Sugar. James Roosevelt, like his father, grew up respectably wealthy near the banks of the Hudson River. After graduating from Union College and Harvard Law School, he became a director of the Consolidated Coal Company, and then the general manager of the Cumberland and Pennsylvania Railway.1 His investments in those companies were profitable, and allowed him to be a man of means, James Roosevelt was dignified and distinguished, and also comfortable and fully content. He was baptized in the Dutch Reformed Church but became an Episcopalian because it was not only his wife s religion but it was favored by his social set.2 Although most of his friends and neighbors were republicans, James was a Democrat who retained his aristocratic values. 3 The Delano s, like the Roosevelts, prospered in America, making a fortune in Chinese opium trade. FDRs mother, Sara Delano spent most of her life growing up in Europe. After attending finishing school in Germany, she returned to America, and at her father s wishes became engaged to her sixth cousin, James Roosevelt.4 On JanuaryShow MoreRelatedThe Success of Franklin Roosevelt1431 Words  | 6 PagesThe Success of Franklin Roosevelt Franklin Delano Roosevelt was President of the USA during a period encompassed two of the most significant events of recent history- the American Depression and the Second World War. 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