Potassium Iodide Lab Essay

I. Title determination the Formula for flatus NitrateII. PurposeThis try was to test the several(predicate) concent ration trains of specified alkali metals to determine the greatest mass of overtake process.III. Background Informationchiliad Iodide atomic number 19 Iodide is a cryst entirelyized, etiolate sodium chloride but known to turn a bright yel scummy when opened 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 handling is in photography but in any case apply in table salt to iodize food and earth-closet be used in expectorants for lung congestion. It can also be used to protect the thyroid from radioactive iodinePotassium iodideIUPAC namePotassium iodideOther namesKalium iodide,knollide, potideIdentifiersCAS number7681-11-0RTECS numberTT2975000Propertiesmolecular(a) f ormulaKIMolar mass166.00 g/molLead NitrateLead Nitrate is a hazardous colorless crystal or white powder. It has a long history of uses. Until 1974, when the dangers of petabyte were realized, it was in a physical body of products.Lead(II) nitrateIUPAC nameLead(II) nitrateOther namesLead nitratePlumbous nitrateLead dinitratePlumb dulcisIdentifiersCAS number10099-74-8RTECS numberOG2100000PropertiesMolecular formulaPb(NO3)2Molar mass331.2 g/molAppearance pureness odourless solidDensity4.53 g/cmMelting siteDecomposes at 290-470 CSolubility in water52 g/100 ml (20 C)Solubility in nitric acidin ethanolin methanolinsoluble1 g/2500 ml1 g/75 mlStructureCrystal mental synthesisFace-centered cubicCoordinationgeometrycuboctahedralHazardsMSDSExternal MSDSEU classificationToxic (T)Dangerous for the surround (N)Repr. 1/3EU Index082-001-00-6NFPA 704033OXR-phrasesR61, R20/22, R33,R62, R50/53S-phrasesS53, S45, S60, S61Flash pointNon-flammableRelated compoundsOther anionsLead(II) chromateLead(II) sulfideOther cationsSodium nitrateMagnesium nitrateIV. Materials* Electronic subdue* Lead Nitrate* Potassium Iodide* Beaker* gradatory Cylinder* Funnel* get across paper* pipets* WaterV. 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 measuring at the appropriate part of the miniscus3. Cylinder was filled with 900 milliliters of KI4. The solution was gently shaken to ensure even distribution of solute to root5. Solution was then transferred to stress paper*Two filter written document were used for double filtration6. The filter paper was put into a displace of a beaker to the solution would separateVI. Dataa) mass of filter paperb) mass of lead iodide3rd period4th period192837465564738291c) molar mass of KI 165.998 g/mold) molar mass of Pb(NO2)3 331.268 g/mole) calculation for ascertain mo larity for apiece solution based on 1,000 mlcc ml/1000 ml x .5 ml = .1 mlf) observationsThe ii liquids started to both appear clear. After combined, it almost instantly turned to a neon yellow. While filtering, a colorless liquid seeped through duration the yellow precipitate clung to the filter paper. There was minuscule water in the flask but over half the filter paper had been cover in neon yellow.e) cautionsOne must ensure toRead the meniscus at the proper point drug abuse a p last(a)ic graduated cylinder for elimination of meniscusMeasure by getting atomic reactor at eye levelCargonfully take proper measurementsUse two filter papers for double filtrationZero the master after first weighing the filter paperUse an electronic scale for accuracyProduct enhancements to minimize phantasmDigital scalePipettes measurements to allow a few drops of solution to be retainPlastic graduated cylinders for no confusionfigure 1 wash setupfigure 2 Pipette dispensing of liquidsfigure 3 filtering setupVII.AnalysisThe research lab performed was found to be an impressionive way of apprehensive 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 victorious place is known to be a double replacement. The two compounds burst out 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 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 distant 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 be subject of the diversity 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 similar 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 whitethorn not have gone to eye level to read each mark carefully to ensure only the most exact measurements. Also, the pipette is made of water ice. This calls for the meniscus to be read properly or else the meas urements 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 distorted 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. Other s used only one paper, allowing as well as 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 occupation 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 succeeding(a) 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 delineate 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 mingled results. This can be due to human error. After realizing the effe cts 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.