Saturday, April 6, 2019

Potassium Iodide Lab Essay Example for Free

super C Iodide Lab strainI. TitleFinding the Formula for contain NitrateII. PurposeThis look into was to test the different assimilation directs of specified alkali metals to determine the greatest quite a little of broaden nitrate.III. Background InformationPotassium IodidePotassium Iodide is a cryst eitherized, smock salt but cognize to turn a bright yellow when heart-to-heart to prolonged moisture such as mix with weewee. It is a simple iodine salt. In its inseparable state it is virtuallyly 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 in any case used in table salt to iodize food and evoke be used in expectorants for lung congestion. It can also be used to protect the thyroid from radioactive iodinePotassium iodideIUPAC namePotassium iodide new(prenominal) namesKalium iodide,knollide, potideIdentifiersCAS modus operandi7681-11-0RTECS numberTT2 975000PropertiesMolecular formulaKIMolar mass166.00 g/ moleLead NitrateLead 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) nitrateIUPAC nameLead(II) nitrateOther namesLead nitratePlumbous nitrateLead dinitratePlumb dulcisIdentifiersCAS number snow99-74-8RTECS numberOG2100000PropertiesMolecular formulaPb(NO3)2Molar mass331.2 g/molAppearanceWhite odourless loyalDensity4.53 g/cmMelting pointDecomposes at 290-470 CSolubility in water52 g/100 ml (20 C)Solubility in nitric acidin grain alcoholin methanolinsoluble1 g/2500 ml1 g/75 mlStructureCrystal structureFace-centered cubicCoordinationgeometrycuboctahedralHazardsMSDSExternal MSDSEU classificationToxic (T)Dangerous for the milieu (N)Repr. 1/3EU Index082-001-00-6NFPA 704033OXR-phrasesR61, R20/22, R33,R62, R50/53S-phrasesS53, S45, S60, S61 show off pointNon-flammableRelated compoundsOther anionsLead(II) chromateLead(II) sulfideOther cationsSodium nitrateMagnesium nitrateIV. Materials* electronic scale* Lead Nitrate* Potassium Iodide* Beaker* Graduated Cylinder* Funnel* Filter reputation* Pipettes* peeingV. Procedures1. Materials were gathered and then specific concentration ratio was received (watersolute 19)2. Cylinder was filled with 100 milliliters of lead iodide*Graduated Cylinder is hydrophobic*Caution Be sure of precise readings by quantity at the appropriate part of the miniscus3. Cylinder was filled with 900 milliliters of KI4. The solution was gently shaken to vouch even distribution of solute to solvent5. Solution was then transferred to slaver paper*Two filter text file were used for double filtration6. The filter paper was put into a funnel of a beaker to the solution would softenVI. Dataa) mass of filter papersb) mass of lead iodide3rd level4th period192837465564738291c) molar mass of KI 165.998 g/mold) molar mass of Pb(NO2)3 331.268 g/mole) calculation for de termining thou for each solution based on 1,000 ml200 ml/1000 ml x .5 ml = .1 mlf) observationsThe devil liquids started to both appear clear. After combined, it al more or less 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) cautionsOne must ensure toRead the meniscus at the beseeming pointUse a plastic graduated cylinder for elimination of meniscusMeasure by getting down at eye levelCarefully take proper measurementsUse two filter papers for double filtrationZero the scale after first weighing the filter paperUse an electronic scale for accuracyProduct enhancements to minimize errorDigital scalePipettes measurements to drop by the wayside a few drops of solution to be retainedPlastic graduated cylinders for no confusion act 1 rinsing setupfigure 2 Pipette dispensing of liquidsfigure 3 filtering apparatusVII. compendiumThe lab performed was shew to be an effective way of discerning the formulation of lead nitrate and kelvin 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 prove was to find which combination of concentrations would consequently amaze the greatest impact on the mass of the Lead Iodide. It was found that when the concentrations of each are 55, 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 th ree classes and the data varied across the chart. The last test group was non 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 19 and 28 varied greatly. The following masses compared were mistakable yet period 3 were all a little lower until the last concentration level measurements which were almost exactly the sameThe 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 justly or else the measurements will be off. To avoid confusi on 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(prenominal) 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 writhe 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. many of them were larger than the others. This can distort the results. The same filter paper should be used for all of those move in the tests.The papers also varied in thickness. Others used only one paper, allowing too frequently 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 humidness 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 nonexistentVII. ConclusionAs 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 evident 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.

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