Potassium Iodide Lab Essay Example for Free

Potassium Iodide Lab Essay I. Title: Finding the Formula for Lead Nitrate II. Purpose: This experiment was to test the different concentration levels of specified alkali metals to determine the greatest mass of lead nitrate. III. Background Information: Potassium Iodide Potassium Iodide is a crystallized, white salt but known to turn a bright yellow when exposed to prolonged moisture such as mixing with water. It is a simple iodine salt. In its natural state it is mostly colorless and odorless. If tasted, it would be like saline and extremely bitter and is has a relatively low level of hazard. Its main use is in photography but also used in table salt to iodize food and can be used in expectorants for lung congestion. It can also be used to protect the thyroid from radioactive iodine Potassium iodide IUPAC name Potassium iodide Other names Kalium iodide, knollide, potide Identifiers CAS number [7681-11-0] RTECS number TT2975000 Properties Molecular formula KI Molar mass 166.00 g/mol Lead Nitrate Lead Nitrate is a hazardous colorless crystal or white powder. It has a long history of uses. Until 1974, when the dangers of lead were realized, it was in a variety of products. Lead(II) nitrate IUPAC name Lead(II) nitrate Other names Lead nitrate Plumbous nitrate Lead dinitrate Plumb dulcis Identifiers CAS number [10099-74-8] RTECS number OG2100000 Properties Molecular formula Pb(NO3)2 Molar mass 331.2 g/mol Appearance White odourless solid Density 4.53 g/cmà ¯Ã‚ ¿Ã‚ ½ Melting point Decomposes at 290-470 à ¯Ã‚ ¿Ã‚ ½C Solubility in water 52 g/100 ml (20 à ¯Ã‚ ¿Ã‚ ½C) Solubility in nitric acid in ethanol in methanol insoluble 1 g/2500 ml 1 g/75 ml Structure Crystal structure Face-centered cubic Coordination geometry cuboctahedral Hazards MSDS External MSDS EU classification Toxic (T) Dangerous for the environment (N) Repr. 1/3 EU Index 082-001-00-6 NFPA 704 0 3 3 OX R-phrases R61, R20/22, R33, R62, R50/53 S-phrases S53, S45, S60, S61 Flash point Non-flammable Related compounds Other anions Lead(II) chromate Lead(II) sulfide Other cations Sodium nitrate Magnesium nitrate IV. Materials: * Electronic scale * Lead Nitrate * Potassium Iodide * Beaker * Graduated Cylinder * Funnel * Filter paper * Pipettes * Water V. Procedures: 1. Materials were gathered and then specific concentration ratio was received (water:solute 1:9) 2. Cylinder was filled with 100 milliliters of lead iodide *Graduated Cylinder is hydrophobic *Caution: Be sure of precise readings by measuring at the appropriate part of the miniscus 3. Cylinder was filled with 900 milliliters of KI 4. The solution was gently shaken to ensure even distribution of solute to solvent 5. Solution was then transferred to filter paper *Two filter papers were used for double filtration 6. The filter paper was put into a funnel of a beaker to the solution would separate VI. Data: a) mass of filter papers: b) mass of lead iodide: 3rd period 4th period 1:9 2:8 3:7 4:6 5:5 6:4 7:3 8:2 9:1 c) molar mass of KI: 165.998 g/mol d) molar mass of Pb(NO2)3: 331.268 g/mol e) calculation for determining molarity for each solution based on 1,000 ml: 200 ml/1000 ml x .5 ml = .1 ml f) observations: The two liquids started to both appear clear. After combined, it almost instantly turned to a neon yellow. While filtering, a colorless liquid seeped through while the yellow precipitate clung to the filter paper. There was little water in the flask but over half the filter paper had been covered in neon yellow. e) cautions: One must ensure to Read the meniscus at the proper point Use a plastic graduated cylinder for elimination of meniscus Measure by getting down at eye level Carefully take proper measurements Use two filter papers for double filtration Zero the scale after first weighing the filter paper Use an electronic scale for accuracy Product enhancements to minimize error Digital scale Pipettes measurements to allow a few drops of solution to be retained Plastic graduated cylinders for no confusion figure 1: rinsing setup figure 2: Pipette dispensing of liquids figure 3: filtering apparatus VII. Analysis The lab performed was found to be an effective way of discerning the formulation of lead nitrate and potassium iodides precipitate and use the chemical formula to understand the reaction. The formula is as follows: KI + Pb(NO3)2 PbI + K(NO3)2. Potassium Iodide and Lead Nitrate yield Lead Iodide and Potassium Nitrate. The reaction taking place is known to be a double replacement. The two compounds split and then combine with the counterparts. The PbI remains in the solution and the K(NO3)2 forms the precipitate. The purpose of the experiment was to find which combination of concentrations would consequently have the greatest impact on the mass of the Lead Iodide. It was found that when the concentrations of each are 5:5, the filtration leaves a substantial amount of the liquid and the yellow precipitate known as lead iodide is at the peak of the masses. The interesting part of the experiment is that it was far from expected results. It was conducted by three classes and the data varied across the chart. The last test group was not able to be used because of the inconsistency in which the obtained measurements compared to those of the rest of the tests. Therefore, only two classes were compared. The 4th period was seen to be the most accurate. The first two measurements, those of 1:9 and 2:8 varied greatly. The following masses compared were similar yet period 3 were all a little lower until the last concentration level measurements which were almost exactly the same The mistakes prevalent in the lab are not due to the experiment itself. Rather, it is human error that can be held accountable for the drastic differences. One of the reasons is improper measuring and mixing to begin. The students may not have gone to eye level to read each mark carefully to ensure only the most exact measurements. Also, the pipette is made of glass. This calls for the meniscus to be read properly or else the measurements will be off. To avoid confusion of the meniscus with graduated cylinders, plastic would be most appropriate. Luckily, these are hydrophobic and without a meniscus, they are simple to read. If glass was used, then it would leave open some opportunities for mistakes. With the pipettes, there could have easily been bubbles. The bubbles would take up space where the liquid should be for precise measuring. If twisted the wrong way, it would be easy for air to get trapped and cause these pockets. The pipettes however are carefully crafted so that the markings are a little above where they should be. Taking that into consideration, the room for error in not allowing all the water to drip out of the pipette, if done properly, is eliminated. Another space for error is the filter papers. Some of them were larger than the others. This can distort the results. The same filter paper should be used for all of those participating in the tests. The papers also varied in thickness. Others used only one paper, allowing too much precipitate through, and others used more than two. This allows the paper to absorb too much liquid instead of filtering it all the way through. An additional problem is evaporation. Leaving the filtration apparatus uncovered could allow gradual evaporation. Quite oppositely, the humidity in the room could also cause tampering with the solution. With the weather changes, the temperature of the lab was not held at a constant. One day it was heated the next was at a very cool temperature. This could easily have an effect on the experiment. All these reasons could have a great deal in the variety of results. The experiment would need to be performed again to accurately portray the data. Human error would need to be nonexistent VII. Conclusion As previously stated, the results of the experiment were not all in agreement. The different classes obtained various results. This can be due to human error. After realizing the effects on the reaction taking place, it was also discernable how concentration can easily affect the combination. However valuable knowledge on the formation of lead iodide was gained from this lab and the purpose was successfully completed.

An Analysis of The Thurber Carnival Essay -- Thurber Carnival Essays

An Analysis of The Thurber Carnival  Ã‚     Ã‚  Ã‚   The Fables for Our Time contained in Thurber's The Thurber Carnival are, in my opinion, particularly good examples of a writer successfully 'breaking frames' in order to create humor and satire. In this essay I am going to explore the main methods Thurber uses to create humor and satire in the fables "The Shrike and the Chipmunks" and "The Unicorn in the Garden"2. Firstly though, what do I mean by the 'broken frame'? This is a reference to the idea that the violation of our 'frames of reference', and the recognition of the incongruity caused by it, is the basic element of humour. If the incongruity needs to be explained, the humour will be lost. Kant expresses this idea when he says "Laughter is an affection arising from a strained expectation being suddenly reduced to nothing"3. Thurber violates several different types of expectation in his attempts to create humour and satire. These range from expectation of the rules of fable and other literature, to expectation of characterisation, and expectation of the familiar saying. "The Shrike and the Chipmunks", is first and foremost a parody of the traditional fable. It has all the traditional ingredients: the anthropomorphised Chipmunks, corresponding with stereotyped human characters, the building of suspense over a perceived right and wrong type of behaviour, a corresponding climax, and a moral at the end. Anthropomorphism is a common technique of humour. Umberto Eco explains that this is so that the audience can laugh at the 'broken frame', without the discomfort of empathy with the frame breaker. "It is for this reason that the animalisation of the comic hero is so important"4. But quite apart from this use, Thur... ... 1-9. Kant, Immanuel. Critique of Judgement, Book II. E307 Photocopy. pp. 196-203. Thurber, James. The Thurber Carnival. Harmondsworth, Middlesex, England: Penguin Books, 1983.    End Notes 1. Umberto Eco, "Frames of Comic Freedom," in Carnival!, ed. T. A. Sebeok (Berlin: Mouton Publishers, 1984), p. 4. 2. James Thurber, The Thurber Carnival (Harmondsworth, Middlesex, England: Penguin Books, 1983). Fables for Our Time pp. 278 - 305. "The Shrike and the Chipmunks" pp. 290-291. "The Unicorn in the Garden" pp. 304-305. 3. Immanuel Kant, Critique of Judgement, Book II, E307 Photocoy. p. 199. 4. Eco, p. 2. 5. Thurber, p. 290. 6. Thurber, p. 290. 7. Thurber, p. 291. 8. Thurber, p.305. 9. Burton Bernstein, Thurber: A Biography (Great Britain: Lowe & Brydone, 1975), p. 308. 10. Eco, p. 2.      

The Oddysey Land of the Dead

Oddyseus started to seak to the spirits of the promising to sacrifice his best cow before she had her calve. Then he promised to sacrifice a black lamb whick was the finest in his heard. After promising to sacrifice the animals he did it. The spirits started to gather at the edge of Erebus, the place where the dead reside. The spirits included those of the young and the old; male and female. There were also many warriors who were still in possesion of their armor and weaponry. The spirits started to try to escape from the pit of Erebus. Oddyseus told his men to skin the animal that they had killed and make them into offering for Hades and Persephone, the god and godess of the dead who reside in the underworld. He sat waiting with his sword out to defend himself from the from the spirits until he noticed te presence of Tieresias, a blind prophet from Thebes, who came forward and spoke to Oddyseus. Tieresias asked him why he was in the land of the dead and to put down his sword. Then the prophet said that he wanted to taste the blood of the sacrifice he had made. Oddyseus stepped aside and sheathed his sword and the prophet bent down to drink. Tiereseus then tells him that anguish and hardship lie ahead and that poseidon is the one that will cause it because Oddyseus blinded his son Polyphemos the cyclops. He then says that Oddyseus will pass through a narrow straight that will take him home, and that Oddyseus will reach Thrinakia, the land of Helio's grazing cattle, where the sun god sees and hears everything. He says to avoid the cattle of the sun god and to stick with trying to get home, but if you butcher the cattle there will be destruction of ship and crew and only you will survive. Tiereseus then says that he will reach home on an unfamiliar ship only to find that men are in you home eating your food and trying to marry your wife. He then says that Oddyseus will kill these men either by stealth or open combat. He then tells Oddyseus that he will travel by land and sea to a landlocked place. The spot will be plain to you he says and the people will ask what kind of wheat sowing device you have. He tell Oddyseus that he will then jam the device, his oar, into the ground. Oddyseus is then told to make a sacrific to poseidon in the form of a ram, bull, buck boar. He tells Oddyseus to then go home and kill 100 pure cattle in the name of poseidon and all the gods. The final thing that Oddyseus is toldis that he will receive an easy death at sea will come to him when he is old, and then the prophet says that all that he has just said will be true as his journey home takes place.

Organizational Behavior Best Buy Inc Case Study - 3183 Words

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