Introduction:
The purpose of this lab was to identify the chemical composition of various mixtures. A process known as chemical qualitative analysis, a process used to test for the constituents present in a mixture (chemical qualitative analysis). Our first test was our magnetism test, this was used to indicate the presence of iron in our sample. The iodine test was used to detect presence of starch, as iodine is an indicator, meaning that it is used to detect the presence of certain chemicals or chemical properties (indicator). Our last test was the flame test, designed to test for the presence of metal salts. Certain metals when burned will release different colored flame, which allows us to detect the type of element present in the solution.
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We then proceeded to take a small magnet used to detect iron in the sample, and wrapped it in a piece of paper to make it easy to remove any iron particles. We moved the magnet over the surface of our mixture and observed to see any movement of particles. If nothing was attracted to the magnet, iron was not present. If iron was not present the only other possible substance in irons category was cinnamon, making cinnamon a part of the mixture. Following that, we added a small amount of the mixture into two small glass vials. We then filled the vials with distilled water and recorded the color of the liquid. We then shook vial A, and poured the mixture into a small glass test tube. From there we took a small eye dropper and used it to add two drops of iodine into the test tube. Since iodine is a starch indicator, if the mixture changes color to a dark blue, it would indicate the presence of corn starch. If no reaction occurred, the mixture would turn yellow, to indicate the presence of baby powder. We recorded these results and moved onto our flame test. We then took a glass funnel, and placed it into a unused test tube. Following this we took a small circle of filter paper and inserted it into the funnel, and wetted it with distilled water so it would stick to the funnel walls. We then poured the contents of vial b through the filter and recorded the color of the resulting filtrate. …show more content…
From the data we gathered, it can be concluded that our sample was a combination of cinnamon powder, baby powder and strontium. However getting to these results wasn't without its complications, the tests we used were subject to contamination from other tests, measurement errors and improper technique. While conducting the flame test we found our platinum rod had foreign metal salts on it which could possibly skew the results of the test making copper appear as strontium and vice versa. This made us need to conduct the test twice to get accurate results. As for measurement errors we identified several problems with consistency of measurements, for instance when adding mixture to vials, we most likely added too much or too little to either vial by accident which would effect the concentration of the mixture in distilled water, this would then effect resulting tests. As for our improper technique, after the fact, we believe we folded the filter paper wrong, which could have allowed larger particles to pass through which could have produced differences in color in the flame test. Luckily if such tests were to be conducted in the future, many of these problems could be easily solved. To solve the foreign metal salt contamination problem, we could have soaked the platinum rods in acid for longer, or used entirely new rods for each test. To solve the measurement errors, we could have used a
During week 1 of this experiment, we recorded common components of fertilizers and then went on to find the chemical formulas involved in creating them. The second week we began the process of comparing three authentic ions we had established in the first week to ion samples to discover other properties they might contain. We decided to discover these different ingredients by preforming a serious of tests, which included placing 0.2g solid of both the authentic and the sample fertilizer separately, in order to establish a constant, and dissolved the fertilizer in 20 mL of water, then checked to see if Mg was present in the sample solution. By setting up a constant and preforming a methodical experiment all on the samples given, we demonstrated the ability to correctly establish and preform an experiment and solve the problem at hand, which was distinguishing the contents of the authentic
Hypothesis: If the mystery powder is compared with the five known compounds, the mystery powder should match the one with the same physical and chemical properties. Also their reaction with water, universal indicator, vinegar and Iodine solution should match if an accurate experiment is conducted.
The procedure of the lab on day one was to get a ring stand and clamp, then put the substance in the test tube. Then put the test tube in the clamp and then get a Bunsen burner. After that put the Bunsen burner underneath the test tube to heat it. The procedure of the lab for day two was almost exactly the same, except the substances that were used were different. The
I would suggest to students performing the nitration to make sure their benzoic acid product is very fine and broken up before reacting it, as it has a tendency to clump together when it dries and thus proves very difficult to react in solution. I would also suggest keeping a very close eye on the temperature when adding the sulfuric/nitric acid mixture dropwise, as the reaction has a tendency to spike in temperature
The lab Water to Grape Juice to Milk went through many chemical changes. For each change a chemical reaction took place. There were five changes that happened all together. Every change was produced by mixing different substances together to produce the outcome. The first change was water to grape juice. This was the reaction between distilled water, phenolphthalein solution, and sodium hydroxide. The reaction was the water with the solution turning purple. Sodium hydroxide and phenolphthalein must have been responsible for the change because when the two things were mixed it caused the color to change. Next was the grape juice to lemonade. This was taking the grape juice and mixing it with sulfuric acid. Once again the reaction was the color
When I dropped iodine to the leaf where I split off from the plant which had waited in red light, its color changed into blue. However, when I dropped iodine to the leaf where I split off from the plant which had waited in green light, its color stayed the same. It is because the plant waited in red light could make more photosynthesis than the other one, so it has more glucose and an iodine solution makes substance’s color blue if it has starch. It is used to test the presence of starch.
In this experiment, the chromatography of skittles and Crayola markers will be used to determine how the dyes that are used in the markers and candy of the same color compare to each other. By finding the chromatography of these substances, we will be able to determine whether the dyes used in these materials are the same or if they differ. We will also be able to determine if the dyes used in Crayola markers are safe to digest. My hypothesis is that the dyes used in Crayola markers and skittles of the same color will differ, but the dyes used in Crayola markers are not toxic. To better support this hypothesis, the process of chromatography and the toxicity of various dyes will need to be explained.
Then, an amount of KI (solid) about a size that would fit on a match head was dissolved in 0.05 of Potassium Iodate solution and about 1 mL of water and 1 mL of 1 M HCl were added, which exhibited a weak positive test for IO_3^- (aq). After the weak positive test, an amount of KI (solid) about a size that would fit on a match head was dissolved in about 1 mL of water and 1 mL of 1 M HCl, which exhibited a negative
The Purpose of the Chemical Reaction Lab was to examine and measure the chemical reaction of H-C-L, hydrochloric acid and CuCl2, Copper chloride solution to determine different types of reactions, within specific elements and compounds; Aluminum foil, Al aluminum shot, Ammonium hydroxide, Magnesium, Silver nitrate, Sodium carbonate, Sodium bicarbonate, Sodium hydroxide, and Zinc. By completing the trials, the data displayed chemical changes. These changes were observable in changes of substances, such as formation of precipitate, change in color, release of gas, and difference of temperature.
Next when the starch test was tested it changed to purple to black.Lastly when Biruret’s solution was tested it turned violet. So, the substances that tested positive were simple sugars (Benedict’s solution)and proteins (Biruret’s
The purpose of this experiment was to use qualitative analysis methods to identify the metal nitrate salts that were present in an unknown solution for parts A and B. In part C, a third method, the cation flame tests, was used to identify cation solutions based on the color that was emitted by the flame.
The purpose for this procedure is for students to familiarize themselves with how different types of properties can lead up to identifying substances. For the safety of this experiment be sure to always have your goggles on and tightly secured, due to any splattering of chemicals or glass breakage. Under no circumstance should any chemical be near your mouth. In this procedure students will use four methods that will help identify what is their unknown substance. Once all methods are done its data will provide physical properties of numerical values which students will compare to the list that will lead to identifying their pure substance. The four methods in this experiment are finding the density (g/mL), the solubility, the melting point
The objective of this lab is to try to separate the different compounds that are contained in cereal.
Experiment #3: The purpose of this experiment to test the chromatography of plant pigments the alcohol test strip test will be used.
This sample will undergo all the steps of the test except for the one being tested for i.e. sugars. If the end result is negative color change (blue) , it will thus be determined that the experiment and the Benidict's reagent is not contaminated and the experiment may proceed. The negative control will also serve as a comparison to gauge against the color change in the other four sugar tests.EXPERIMENT 3: Test for Sugars: TESTS MAT. & METHODS HYPOTHESIS RESULTSTube 1 1cm water+2cm Benidict's reagent.