Discussion of Results The primary goal of this laboratory is to correctly identify an unknown substance. To achieve this task, one may use various tests that reveal both chemical and physical properties of a substance. By comparing the results of a known substance and the unknown substance, one may eliminate alternative possibilities and more accurately predict the undisclosed compound. Furthermore, by performing these tests, data can be collected and verified regarding chemical and physical properties of the unknown. Understanding the chemical properties of a known substance aids one’s understanding of the unknown based on comparative analysis of the results of the tests.
Record each result individually then add to your results. To Measure the Copper in the Ore Put approximately 9-10(g) copper ore into beaker. Use spatula to break up any large pieces. Next add 17ml H2SO4 (aq) (hydro sulfuric acid) to the beaker. Began mixing until all or most traces of blue dissipate; or the copper ore will no longer dissolve (should appear as a milky liquid). Next use pipette to and remove solution and divide solution into 2 individual test tubes then Place test tubes into centrifuge and run centrifuge for 1 minute. Remove from centrifuge machine Fill a cuvette with the clear solution from the test tube making sure not to disturb the sediment at the bottom. Note the solution should bluish in tint Final place the cuvette in the colorimeter. Then record data and calculate in results section.
When one looks back at the procedure of the experiment, trials 1, 2, 3, 4, 5, and 6 all use 6 M HCl for their reactions, and if this were to be substituted for 6 M HNO3, then these reactions would have still taken place, except in trial 2 because copper is less reactive than hydrogen in all cases, but their final observations may yield different colored solids and solutions (Beran,
LABORATORY REPORT Activity: Effect of Dietary Fiber on Transit Time and Bile Name: Hope Schallert Instructor: Dr. Weithop Date: 03.08.2015 Predictions Dietary fiber will: increase transit time Dietary fiber will increase the amount of bile acid in solution Materials and Methods Effect of Dietary Fiber on Transit Time 1. Dependent variable. number of radiopaque markers in GI tract 2. Independent variable. amount and type of fiber in meal 3. Controlled variables. calories in meal, nutrients in meal Effect of Dietary Fiber on Bile Acid Adsorption 1. Dependent variable. amount of bile acids in solution 2. Independent variable. amount of fiber in meal 3. Controlled variables. moisture in meal, size of meal particles, calories and again I am going to assume this is soluble since I have not done it yet RC42 17 0 LC33 21 4 SC13 17 4Total 83 54 8
calcium phosphate: Ca2+ PO43- = ………… 38. When naming binary ionic compounds, write the name of the positive ion (cation) first,
also used to neutralize any base that may have been present. The unknown sample was then heated in boiling water in step 5. The reason for heating the
Abstract This paper describes the methods used in the identification, investigation of properties, and synthesis of an unknown compound. The compound was identified as calcium nitrate by a variety of tests. When the compound was received, it was already known to be one of twelve possible ionic compounds.
Task 1: M1 Vacuum Filtration: Vacuum filtration is the method of separating a solid product from a liquid or solution mixture. The mixture is poured through a Buchner funnel containing filter paper. The filter paper holds the solid particles and the liquid draws through the funnel into the flask below. • In order to
3- A) Unknown 3 b) Iron and Barium were present in unknown 3. Assigned unknown reacted with all 4 reactants and formed precipitate with 3 of them (Sodium carbonate, sodium hydroxide and Sulfuric acid). During the experiment it reacted very similarly to Iron (III) nitrate and Barium nitrate. For example, with
Our objective for the Sherlock Holmes Experiment was to illustrate that some chemicals can be identified or differentiated by simple chemical tests, such as solubility, pH, or color tests. In our group we had to test come common powders such as Alka-Seltzer, baking soda, flour, Vitamin C (ascorbic acid), and salt. Other chemicals that were used to do this experiment were vinegar, and Iodine 2 Solution. The equipment used to do this experiment was red litmus paper, and 5 test tubes per group.
Discovering the makeup of a mystery powder by doing the same tests to see whether those powders are existent in the mystery substance.
Identifying an unknown substance can be accomplished with the use of multiple scientific tests, which help narrow down the possibilities of the unknown compound. The unknown substance that I was given was unknown number A84841BIR, and posed to be a real challenge since I needed to test two different molecular combinations for this specific substance. Once the number of moles in substance was calculated using the ideal gas law, I divided it from the sample mass number after heating and obtained that the molarity of my unknown chemical was 58.93 g/mol. To find my molecular formula I calculated the mass of each element, then the moles, lastly I took the smallest whole-number ratio. Using the molarity calculated I was able to do some research to get a better understanding about what my unknown chemical could possibly be. Once I’ve collected all my data together and strenuously researched the web for articles relating to understanding Infa-Red spectroscopy, I should be able to make an educated guess upon what my unknown solution could be.
Experimental Procedure: Obtain a screw cap and vial which will be ran in the Gas Chromatograph. Fill vial no more than half full of pre prepared unknown compound which is dissolved in either ethanol or acetone.
Quantitative analysis is the determination of an amount present in a variety of settings. On the other hand, qualitative analysis is the determination of non-numerical information about a reaction, such as observing that a reaction results in a color change. There are chemical changes that separate cations and physical separations,
QUALITATIVE ANALYSIS CHMY 141-018 TA: Casey Kennedy 10/28/15 Introduction In many cases, scientists don’t often have all the details when performing experiments, and there is almost always some aspect that is unknown. In certain scenarios, a chemist may not know what elements or compounds are present in a specific sample, so they must be able to recognize properties characteristic of certain elements and compounds, to determine their presence in the unknown sample. When working with unknown ions, it is often best to use known solubility rules to manipulate, separate, and identify the unknown ions present in a sample. In practice, this usually involves using specific reagents to cause some of the ions to fall out of solution as a solid precipitate, then separating the ions in the precipitate from the ions remaining in solution that are soluble with the specific reagents used. This process is repeated, causing ions to separate either by dissolving them in solutions that they are soluble in, or causing them to form insoluble compounds and fall out of solution as a solid precipitate until the ions have been isolated from each other. Once isolated, the ions are then treated with compounds which react in a distinct manner with specific ions, allowing their identities to be confirmed. In the first portion of this experiment ions are mixed in spot tests with separate reagents, specifically to observe and record the reaction that occurs. These observations can then be used to help