Spotted Horses :: essays research papers

"Spotted Horses" Vs. "Mule in the Yard" William Faulkner wrote two short stories, which are alike in many aspects. "Spotted Horses" and "Mule in the Yard" are short stories that both involve comic animal chases and financial transactions. Even though the stories are written by the same author, have similar characteristics, and share similar plot features, they are entirely different stories. The stories are both examples of interpretive literature, however "Spotted Horses" is a more interpretive short story than "Mule in the Yard because "Spotted Horses" fits Perrine’s profile of interpretive literature, and "Mule in the Yard" seems to replicate Perrine’s profile of escape literature. According to Laurence Perrine in his seventh edition of Literature: Structure, Sound and Sense he states the definition of interpretive literature is "Literature written to deepen and broaden and sharpen our awareness of life." Interpretive literature is not candy coated. It allows its readers to experience the trials and tribulations of life. By using graphically realistic plots and endings, which are consistent to those in real life, interpretive literature achieves a higher literary value than escape literature. Interpretive literature allows its reader too step out of the fantasy world they might be living in and focus on what the world is really about. One might say an interpretive story provides insight to understanding. Not only understanding of ourselves, but our neighbors, friends, family or anyone else we might encounter. Escape literature is the complete opposite of interpretive literature. Escape literature is written purely for entertainment. Escape literature takes it’s reader out of the real world and into a fantasy world where everything works and happens just like we want it to. This is a world where the ending always has closure. Escapist authors hardly ever end on a bad note. They want the reader to leave the pages of their story satisfied, and having a sense of contentment. Perrine’s example of escape literature is Cinderella. Cinderella’s life goes from rags to riches in one night. She marries a prince and lives happily ever after. According to Perrine the most common expectations of escape literature readers are the sympathetic heroes or heroines, the suspenseful plot which one exciting event proceeds another, the resolved happy outcome, and the theme. Escape literature themes confirm the reader’s previous opinions of the world. Readers of escape literature read for pleasure not to gather knowledge on how to survive in the real world.

Analysis of the Nitrogen Content of Lawn Fertiliser Essay

Research Question: What is the percentage by mass of nitrogen (from the ammonium ion NH4+) in Bunnings Green Up brand of lawn fertilizer compared to the manufacturer’s specification of 12.3%? Aim: To determine the percentage by mass of available nitrogen, present as the ammonium ion, in Bunnings Green Up brand of lawn fertiliser, then comparing it with the one specified by the manufacturer. Hypothesis: Since the ammonium ion (NH4+) present in fertilisers is a weak acid, it is hard to obtain an exact end point. Hence, back titration can be used to determine the percentage by mass composition of nitrogen in the fertiliser. To deduce the amount of nitrogen in ammonia, the NH4+ ion is reacted with an excess of NaOH, and the amount of unreacted NaOH found by titration with HCl is used to deduce the amount of NH4+ ion present by subtracting it from the initial amount of NaOH to find the amount that reacted with it. From this, the percentage by mass of nitrogen present in the fertiliser can be found and subsequently compared to the manufacturer’s specification. It is hypothesized that the percentage by mass of nitrogen present in the fertiliser will be similar or close to that specified by the manufacturer (12.3%). Materials: * * 100 cm3 of 0.1 mol dm-3 NaOH * 100 cm3 of 0.1 mol dm-3 HCl * 1.5 grams of fertiliser * 250 cm3 volumetric flask * 3 à ¯Ã‚ ¿Ã‚ ½ 250 cm3 conical flasks * 20 cm3 pipette * Burette and retort stand * 50 cm3 measuring cylinder * Bunsen burner, tripod, gauze mat * Mortar and pestle * Electronic balance * White tile, bench mat * Funnel * Spatula * Red Litmus paper * Methyl red indicator * Safety Measures: * Safety goggles must be worn at all times. Sodium hydroxide can react with the proteins in the eye. * Wear a lab coat. Hydrochloric acid can cause severe skin irritation. If any is spilt on the skin, wash it off with water immediately. * Ammonia vapour irritates the skin, eyes, and respiratory system. Method: 1. Accurately weigh about 1.2 grams of fertilizer. Record the brand of the fertiliser and the nitrogen content as specified by the manufacturer. 2. Dissolve the fertiliser in 250 cm3 of distilled water in a volumetric flask. Add the fertiliser first using a funnel and then add the water, allowing it to take with it the fertiliser remaining on the funnel, to the calibration line, stopper, and swirl the contents to dissolve the ammonium compounds in the fertilizer. 3. Using a pipette, dispense 20 cm3 aliquots of the fertilizer solution into three conical flasks. 4. Thoroughly wash the pipette and rinse it with a small volume of standard NaOH solution. Place a 20 cm3 aliquot of NaOH solution in each of the flasks containing fertilizer solution. Record the concentration of the standard solution of NaOH. 5. To one of the flasks, add 50 cm3 of distilled water. Boil the mixture for about 10 minutes. If necessary, add more water to maintain a constant volume of solution whilst boiling. Test the vapour at the neck of the flask with a moist strip of red litmus paper. If ammonia is present the paper will turn blue and heating should be continued until the point where litmus paper does not detect the presence of ammonia. Once this point has been reached, cool the flask under running water. 6. Repeat Step 5 with each of the other two conical flasks. 7. Rinse and fill a burette with standard HCl. Record the concentration of the acid and the initial burette reading. 8. Add two to three drops of methyl red indicator to each conical flask containing the fertilizer mixture, and titrate. The end point occurs when the initially yellow solution becomes orange. For each flask, record the burette reading once the end point has been reached. Data Collection: Table 1: Titration of the excess NaOH (0.084 mol dm-3) against HCl using Methyl Red Indicator Conclusion/Evaluation: Fertiliser is a natural or synthetic chemical substance or mixture that is used to enrich soil in order to promote plant growth. It influences grass colour, ability to recover from stress, and helps prevent weed invasions and diseases. Plants require more than a dozen different chemical elements but nitrogen, phosphorus, and potassium are the three major nutrients needed by lawns; Nitrogen is the nutrient required most as it promotes growth and keeps the grass green, although too much nitrogen can have harmful effects on plants and crops, and on soil quality. In this investigation, the percentage by mass of nitrogen from the ammonium ion in the sample fertiliser is being determined. The manufacturer’s claim of the amount of nitrogen present in this type of fertiliser is 12.3%. The ammonium that is present in fertilisers is a weak acid, thus it is hard to identify a sharp end point in direct titrations with the naked eye. Back titration is used instead. It is an analytical chemistry technique in which the unknown concentration of a reactant can be found by reacting it with an excess volume of another reactant of known concentration. The resulting mixture is then titrated back, taking into account the molarity of the excess which was added. Before titration, the sodium hydroxide was reacted with ammonium in the fertiliser to produce ammonia and water: NH4+(aq) + OH-(aq) –> NH3(g) + H2O(l) The basic solution needed for titration was reached through heating the solution to remove the ammonium ions. By heating it, the rate of reaction between the ammonium ions and hydroxide ions increases, consequently producing water and ammonia. Since ammonia is an extremely volatile gas, boiling the solution will result the vaporization rate, which is the desired outcome. The ammonium ions are also the limiting reagent thus once completely reacted, ammonia production ceases. This is indicated when the red litmus paper, which tests for the presence of a base, no longer turns blue meaning the ammonia has completely evaporated and no longer present in the solution. By titrating the excess, unreacted hydroxide ions with standard hydrochloric acid, it allows us to calculate the amount of unreacted hydroxide ions since the molar ratio is equal, and from this the amount of reacted hydroxide ions with the fertiliser solution can be deduced. Subsequently, the amount of ammonium ions initially present in the 250 cm3 volumetric flask can be found and then the mass of nitrogen ions can be calculated. From this, the percentage by mass of nitrogen in the sample of fertiliser can be found. It was found that the percentage by mass of 1.209 g of fertiliser was 13.87% (? 1.00%). This is very close to the percentage of nitrogen present in the fertiliser as specified by the manufacturer – 12.3%. This discrepancy may be due to several errors and limitations encountered throughout the experiment. The percentage difference of 12.76% is greater than the percentage uncertainty of 6.34% and as a consequence random errors alone cannot alone account for the difference. There must be systematic errors inherent to the investigation or the apparatus. Measurement errors could be the main source of uncertainty. One source of error could be that the exact mass of the fertiliser sample as measured on the electronic balance is not the same as in the volumetric flask, consequently affecting the final result. The loss due to the transfer process into the flask which could be reduced by sufficiently rinsing the apparatus used to transfer, weigh and grind the fertiliser sample ? the funnel, weighing bottle, spatula and mortar and pestle ? so that all sample weighed is transferred into the volumetric flask. Another possible error is that the meniscus of solutions measured was not sitting exactly on the calibration line in the volumetric flask when preparing the standard solution. This may affect the results as the expected volume of the standard solution would differ from the actual volume measured. This can be overcome by allowing more than one individual to test whether or not the meniscus is positioned on the etched mark, making sure it’s at eye level, which will effectively limit this parallax error. The interpretation of the orange colour determined at the end point could also have been another error. Subjective judgment when determining the shade of orange is another factor which may have affected the titre volume, and thus the final outcome. This problem was exacerbated by the fact that the methyl red indicator does not provide a sharp and easily distinguishable end point, as the colour change from yellow to orange. This may be overcome by using another indicator that allows for a clearer colour contrast. Another possible limitation which may have impacted the results is that some ammonia may still have been present in the conical flask. Although the red litmus paper may have served its purpose, this may still occur as a result of not boiling the solution long enough and thus some ammonia may not have evaporated. The result of this is that the ammonia in the solution will react with the hydrochloric acid, and therefore more hydrochloric acid will be required for the equivalence point to be reached, affecting the titre volume. This can be easily overcome by ensuring that the fertiliser solution containing water and sodium hydroxide is boiled for long enough so that all ammonia can evaporate, while simultaneously ensuring that the solution remains at a constant 90mL. The use of tap water may also have affected the results. It may not have been at a pH of 7 or may contain other contaminants such as salts which may ultimately interfere with the results. To overcome this, the most effective way is to use deionised water. Conclusion: It was found that the percentage by mass of nitrogen from the ammonium ion in Bunnings Green Up brand of lawn fertilizer was 13.9% (? 1.00%). This was very close to the percentage of nitrogen in lawn fertiliser as specified by the manufacturer ? 12.3%. Bibliography: 1. Unknown Author, http://www.urbanext.uiuc.edu/lawntalk.htm 2. Chemistry for the International Baccalaureate, 2005, IBID Press

The Future Of Music Is Now - 1317 Words

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