Aluminum Nitrate Nonahydrate Lab Report

The solution was subsequently arranged into a reflux apparatus which included a wet paper towel in order to prevent vapor loss. The solution was refluxed at a temperature ranging from 180°C-185°C for thirty minutes via sand bath. The contents of the micro-test tube were then cooled to room temperature followed by an ice bath in order for crystals to form. The crystals were then collected via suction filtration using a Hirsch funnel. The product was washed with ice-cold xylene (3

In account for weighing, because the sample is an unknown, students do not know what the sample is or what it contains. The three samples of the unknown A had to be weighed around 0.4000g. If the sample was not weighed at a quick rate, it would collect moisture from the air and disturb the weighing process by causing it to be higher than expected. Because three samples had to be weighed out at the same time, there was plenty of time for the unknown to collect moisture from the air allowing the sample to contain more moisture and less of the unknown sample. Also, the weather could affect the weight of the sample along with the season. During the summer time, humidity is more common than in the winter. With humidity comes an abundant amount of moisture within an area, specifically a laboratory.

An error that occurred during within this lab experiment was not weighing the beaker at the same, tampering with the results. There was chaos within the first beaker it could not be be put on the plastic balance. Making a quick decision that was not in the procedure, which was wait 3 and half mins before weighing the becker instead of 1 min after boiling out water and the cardondixode gas out. this caused the lab experiment to had a later start time. The time of weighing the sodium acetate was effect within this error caused the results to be different.

Acidity was measured again (pH = 3.5). Ice bath (10 minutes) and evoked crystallization. After crystallized fully, vacuum filtrate (5 minutes) the crystal-liquid mixture. Residue, white powder, was rinse by cold ethanol and collected.

This lab mainly focused on presenting 10 elements (2 unknown) that could be analyzed and then grouped together predominantly by metallic character. Each element was observed thoroughly and the findings can be seen in the above data table. By viewing the periodic table and observations, each element was labeled as either a metal, nonmetal, or metalloid, providing insight towards each element's physical properties and behavior with the two solutions, hydrochloric acid and copper chloride. The nonmetals, sulfur and carbon, did not undergo a chemical reaction with either solution.

he Stream Team tested the nitrate levels, air temperature, dissolved oxygen, pH, turbidity, and phosphate in the stream. The Nitrate test the average of all the tests taken where .25 mg/L.The air temperature of the day the test was taken was 11.7 degrees Celsius. The dissolved oxygen levels of the stream the day of testing were 5 mg/L.The average pH levels were 7.85. The turbidity of the stream the day we tested was 10 NTU.The phosphate level for the was not available because all tests performed showed there was no phosphate in the stream. The stream tested was Cole Camp Creek.Beginning at 0857.All of the tests were taken from circulating water.

As starting materials, Mg (NO3)2·6H2O, and Fe (NO3)3. 9H2O were used to prepare MgFe2O4 MNPs. Firstly, 0.2 g of the tragacanth gum (TG) was dissolved in 40 ml of deionized water and stirred for 80 min at 70 °C to achieve a clear tragacanth gel (TG) solution. After that, the stoichiometric mixtures of the mentioned materials were added to the TG solution and the container was moved to a sand bath. The temperature of the sand bath was fixed at 80 °C and stirring was continued for 12 h to obtain a brown color resin.

In this experiment the purpose was to see if E. coli could express a his-6 tagged recombinant Green Fluorescent Protein (rGFP) in a bacterial culture. Purifying the sample through Ni 2+ Agarose Chromatography and then discovering the total protein yield through Bradford Assay determined expression of his6 tagged recombinant rGFP in E. coli. The purity of rGFP in the samples was examined and the strength of the bands that appeared at about 34.0 kDa (the MW of rGFP) in association to the ladder lane of the SDS-PAGE gel. Then a Western Blot was performed for the comparison of rGFP bands to the ladder to reasonably determine the molecular weight of rGFP. It was determined that the purity of the band of E2 was at 80 %, which made the calculated

Cold deionized water (20 mL, 1.11 moles) was added into the detached round bottom flask, and the reaction was allowed to crystallize for 2 minutes. The crude product was vacuum filtered, and washed twice with deionized water (50 mL). The filtered crystals were dissolved in ethanol (15 mL, 0.261 moles) in a

Materials and Methods The Lab was a sum of three parts. First, Zeolites and magnetized zeolites were created with 3.754g of sodium aluminate in a 250-mL beaker, containing 50 mL of 3.0M NaOH. The solutions were left to stir gently and heated on a hot plate to fully dissolve the sodium aluminate. 50 mL of distilled water solutions were heated to a gentle boil. Once the distilled water boiled for each sequestration agent, 2.659g of sodium silicate was added to water then dissolved.

General Chemistry Lab: Lab report For the materials list and procedure, see attached. The purpose of this lab is to understand the difference between chemical and physical changes and apply the knowledge to different labs to figure out what the change is whether it be physical or chemical. Practicing lab safety, goggles taking precautions with hot materials, etc. For each of all six of the experiments it was concluded for each one whether or not it was chemical or physical, for the first lab, copper sulfate and water were mixed , the mixture was then left to dry and formed larger, glass-like crystals, this was concluded as a physical change because there was no change in molecular structure to make it a chemical change.

Silver is a very interesting element to watch react. Our guiding question in this lab “What is the percent yield between the reaction silver nitrate and copper?”. There are two key words in this lab, theoretical yield and experimental yield. Theoretical yield is is the amount predicted by stoichiometric calculations. Experimental yield is the actual yield the amount produced in the experiment.

This reaction is observed to be an SN1 reaction which was later verified by the silver nitrate test. The percent yield obtained for mass was 28.9%. The reason the percent yield was low could be due to the loss of product. This could have happened in several ways including the loss of the organic phase during extraction where too much of the organic phase could have been extracted resulting in less of the product being formed. The lower percent yield may also be due to the reaction not going to completion, resulting in fewer product formed.

Atomic Number: 7 Atomic Weight: 14.0067 Melting Point: -346.00°F Boiling Point: -320.44° F Density: 0.0012506 g/cubic cm Elemental State at Room Temperature: Gas Element Classification: Non-metal Introduction Nitrogen was discovered in 1772 by Daniel Rutherford. It is one of the most bountiful elements to exist. Nitrogen gas makes up 79.09% of the earth's atmosphere weighing over 4 trillion tons. It is created from liquefied air by the process known as fractional distillation.

Once cooled, the mixture was then transferred to a separatory funnel using the funnel while avoiding adding the boiling chip. 10 ml of water was then added to the mixture. The mixture was gently shaken and the phases were allowed to separate. The funnel was then unstopped and the lower aqueous phase was drained into a beaker. 5 ml of 5% aqueous NaHCO3 was added and then shaken gently. A great deal of caution was taken into consideration because of the production of carbon dioxide gas which caused pressure to develop inside the funnel. The pressure needed to be released so the funnel was vented frequently. The phases were allowed to separate and the lower aqueous phases was drained into the beaker. After draining, 5 ml of saturated NaCl was added to the funnel and then shaken gently. Once again, the phases were allowed to separate and the lower aqueous phase was drained into a beaker. An ester product was produced and was transferred into a 25 ml Erlenmeyer flask. This organic product was then dried over anhydrous Na2SO4 to trap small amounts of water in its crystal lattices thus removing it from the product. Finally the ester was decanted, so that the drying agent was excluded from the final product.