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Identifying Unknown Substances From Characteristic Properties
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The purpose of this experiment was to determine the properties and identity of an unknown white compound, and create a synthesis reaction to verifiably produce one gram of the compound. The compound was identified as sodium acetate using solubility, ion, pH, flame, and acidification tests. For both the unknown and synthesized compounds, the solubility test was positive, the pH test result was 7.5, and the acidification test produced a strong vinegar smell, all of which were results consistent with known properties of sodium acetate. Additionally, the cation/anion and flame tests were conducted comparatively with sodium acetate and the unknown compound to show that neither contained ammonium, halide, sulfate, or carbonate ions, and that both burned with a bright orange or yellow flame. Lastly, the synthesis reaction was then conducted to produce sodium acetate through a reaction of sodium hydroxide and acetic acid. The reaction produced 0.972 grams, for a total percent yield of 94 %, and the product was verified as sodium acetate. Introduction Since the beginning of modern science, one of the central themes of chemistry has been to discover and interpret the way elements and compounds form, interact, and shape the world around us. More recently, this has even expanded to creating elements that are not …show more content…
Identifying unknown compounds is a crucial application of chemistry, regardless of the situation, and there are many techniques that can be employed to achieve the same goal. Both this experiment and the research intended to develop a way to quickly and accurately identify a compound, and used known chemical principles to decisively predict the its properties. Discovering that information is important in both situations, as it allows the experimenter to safely handle and dispose of an unknown
The purpose of the Unknown White Compound Lab was to identify the unknown compound by performing several experiments. Conducting a solubility test, flame test, pH paper test, ion test, pH probe test, conductivity probe test, and synthesizing the compound will accurately identified the unknown compound. In order to narrow down the possible compounds, the solubility test was used to determine that the compound was soluble in water. Next, the flame test was used to compare the unknown compound to other known compounds such as potassium chloride, sodium chloride, and calcium carbonate. The flame test concluded that the cation in the unknown compound was potassium. Following, pH paper was used to determine the compound to be neutral and slightly
The primary goal of this laboratory project was to identify an unknown compound and determine its chemical and physical properties. First the appearance, odor, solubility, and conductivity of the compound were observed and measured so that they could be compared to those of known compounds. Then the cation present in the compound was identified using the flame test. The identity of the anion present in the compound was deduced through a series of chemical tests (Cooper, 2009).
The purpose of conducting experiment was to determine the identity of white compound. Based on the 5 gram of unknown white compound several experiment conducted including solubility test, pH test, flame test, and ion test. Several materials including chemicals used throughout experiment and will be described through paragraphs.
Introduction For this lab, a number of reactions were performed to aid in the identification of a set of cations. This process was performed to show the effects various chemicals have on the given set of cations. The method through which this experiment was performed included mixing two reactants, a cation and a chemical compound, then examining whether or not a precipitate was created by the mixture. If a precipitate did form, the mixture was then centrifuged to solidify whatever insoluble material was created.
When it came time to test the chemical properties the class looked for things like temperature, color change, and gas released. The class left a well tray with four different combinations including the mystery mixture. The next day they looked at the chemicals and the mystery mixture and the baking soda citric acid were the same color. The baking soda and citric acid along with the mystery mixture were a clear color. The class did a big group experiment to find that the temperature of baking soda and citric acid was 16.7ºC. As they looked at the gas being released they noticed that it kind of left a fog and when you stirred it slowly went
The purpose of this lab was to figure out how much energy and weight from the dart was needed to puncture the plastic film, or causing it to fail. Molecularly, the lab was testing to see if there was enough weight to break the bonds that make up the plastic film. Physically, if the energy and weight was powerful enough, then this would create a hole in the plastic film upon contact with the dart. The critical parts of this machine were the “O” ring and the weights. During this lab it was important the the “O” ring was functioning properly. This meaning that the “O” ring could hold the plastic film taut in order to accurately determine how much energy was needed to tear the film. Also, the weights were important because the weights were crucial
Balance the following chemical equations and separate the coefficients by commas and a space respectively (put a 1 if the coefficient is assumed 1): 5.3 Types of Chemical Reactions 5.3.1 Combination reactions Combination reactions are when two separate species react together to produce a new more complex compound. In other words, two species combine to form a new compound. These reactions take the form of: X+Y →XY Combination Reaction Synthesis reaction - sodium chloride formation of sodium metal and chlorine gas. Types of chemical reactions, part 1 of 7. Educational chemistry for kids.
In this lab, a metathesis reaction between an unknown metal carbonate (M2CO3) and calcium chloride (CaCl2), dependent on the ionic states of both compounds, allowed for identification of the metal through gravimetric analysis. Two grams of the metal carbonate were measured using an analytical balance and then dissolved in an aqueous solution with CaCl2 such that CaCo3 and a metal chloride formed from the reaction. The total mass of the metal carbonate was 112 grams per mole. Subtraction of the mass of CO3 from the total mass informed the metal’s identity: sodium. Due to the loss of precipitate and the utilization of two pieces of filter paper, a wide margin of error exists.
The unknown compound was found to contain sodium and sulfate throughout many different chemical tests. These chemical tests also helped to determine that the compound was polar and a conductive ion.
HYPOTHESIS In this lab, one will expect the mass of the reactants and the mass of the products to remain the same when chemically combined in a closed environment. One can clearly see this is the case since the law states that mass should remain the same, in theory. OBSERVATIONS
This experiment synthesized luminol (5-Amino-2,3-dihydro-1,4-phthalazinedione) and used the product to observe how chemiluminescence would work. The starting material was 5-nitro-2,3-dihydrophthalazine-1,4-dione, which was, after addition of reaction agents, refluxed and vacuum filtered to retrieve luminol. Using two stock solutions, we missed our precipitated luminol with sodium hydroxide, potassium ferricyanide, and hydrogen peroxide, in their respective solutions, in a dark room, to observe the blue light
[4]Creative Chemistry - Fun Activities, Worksheets, Games and Revision Quizzes. Web. 08 Oct. 2011. .
When I found out I had to take a communications course, I thought I was going to die. I literally thought I was going to pass out during a speech and hit my head in front of the entire class. Alas, I can know say I made it through a public speaking course. I know it sounds dramatic, but the idea of speaking for an audience simply terrified me. In taking the course, I realized that communications did not only entail public speaking, but also the ability to communicate with others on a day to day basis. As the course progressed, I began to hone in on specific goals for myself as communicator, which included the development of my verbal delivery skills, the improvement of my nonverbal delivery skills, as well as becoming a stronger
Photosynthesis is the process where plants transform light energy usually from sunlight into chemical energy and its balanced equation is 6CO2 + 6H2O –light energy----> C6H12O6 + 6O2 (Elsevier B.V.,LiveScience). Photosynthesis has major byproducts including water, glucose and starch(which is produced in the plant), and last but not least; oxygen. There are numerous amounts of plants all around the world producing CO2 necessary for human survival. However, the photosynthesis cycle is not visible which results in the plants appearing like they are not doing anything. One way to clearly prove that plants are indeed performing photosynthesis is to observe the plants giving off oxygen; which is one of the most important results of
This semester has taught me a lot of new things, to use as a writer, that I either was not very good at, or did not know before the semester began. One of the things that this semester has taught me was synthesis. This was the first time that I believe I have used synthesis. At least aware that I was using synthesis. I was not very good at it at first. I was confused by it, and I thought that it was stupid to use. However, as the semester went on, the better I got at it and the more I understood how much more effective this was, when developing your argument. There one worksheet to where it helped me understand synthesis more. I believe we did the worksheet during project 2, with the exercise consisting of, creating a paragraph using synthesis