Discussion and Scientific Explanations In this experiment, we were given three main goals to accomplish. We were to identify the compound through a series of organized experiments and analyze as many physical chemical properties as possible. During this experiment, we carefully examined the unknown compound and followed specific tests and steps to determine the identity of the compound. Our first week of testing, we began our experiment by observing the unknown compounds physical properties, which included state and color. The compound was clear/white with a granulated texture and crystallized state. There was no scent, as seen in Table 1. The second test we performed was the solubility test. Our group followed the directions of …show more content…
The fourth test we performed was the chloride anion test. To perform this test, we followed the directions in the lab manual to determine if our unknown compound would form a precipitate in a chloride substance. As seen in Table 5, it was found that our unknown compound did in fact form a precipitate when placed in the presence of chloride. This occurred because we placed our unknown compound in 1 mL of water, added 1 mL of HNO3 and 1 mL of AgNO3. This mixture formed a precipitate of AgCl (silver chloride) because the ions the two compounds are both ionic, therefore creating an ionic bond between the Ag and Cl. Due to the opposite bonds, the mixture creates a precipitate of AgCl, confirming our compound to consist of chloride. The fifth test we performed was the flame test, which is another way to identify cations in a substance. We used the nichrome wire to gather our sample and placed it over the Bunsen burner. We saw that the fire was a bright orange/yellowish color. We then tested the first substance on our list: Sodium and its burning color matched our unknown substance – bright orange/yellow. We then held up a blue cobalt glass to see if there was a change in color. When the unknown compound and NaCl both had blue flames and the yellowish orange was removed, we could determine that they were the same compound. We consulted our lab assistant to determine if our
In this Chemistry Lab the main objective is to perform accurate chemical analysis for the quantity of elements and compounds in a sample. There will be a compound made then synthesized. The methods used were acid-base titrations, redox titrations, gravity filtration, and distillation. General conclusions included
The hypothesis is correct. Potassium chloride mixed with silver nitrate creates a white precipitate. Barium
3. Carefully felt the sides of the test tube and observed the resulted chemical reaction for about 30 seconds.
Procedure: In this experiment, various chemicals were mixed together, to determine a reaction. Using two drops from chemical 1 and two drops of chemical two, unless otherwise stated, then recording the type of physical reaction or color changes that occurred.
The purpose of this particular lab was to experiment and identify the chemical and physical changes throughout the experiment.
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.
and Cl - . If Ag + was present instead, then the solution would have consisted of silver chloride
In reference to the analysis of anions, Table 1 shows that a precipitate was formed when our unknown was combined with HNO3 and AgNO3, thus indicating the presence of a chloride ion. Because our unknown did not form a precipitate due to HCl and BaCl2, separate, effervesce, or smell, we concluded that neither sulfate, nitrate, carbonate nor
In a chemistry stockroom, a vial of an Unknown White Compound was found. In order to properly dispose of the substance, the substance has to be identified .The possible compounds has been limited to one of 15 different compounds. Also, approximately 5 grams of the Unknown White Compound (UWC) were available for testing. In order to determine the properties of the compound, a series of tests was conducted. These tests included a ph test, a conductivity test, a flame test, a sulfate test, a halide test, an ammonium test, a solubility test, and a carbonate test. Using the results of these experiments, it was hypothesized that the UWC is potassium chloride. To further confirm the hypothesis, a synthesis of potassium chloride was conducted.
Eleven mystery test tubes labeled from K-1 to K-11 contained: 6M H2SO4, 6M NH3, 6M HCl, 6M NaOH, 1M NaCl, 1M Fe(NO3)3, 1M NiSO4, 1M AgNO3, 1M KSCN, 1M Ba(NO3)2, 1M Cu(NO3)2 respectively. The contents of the test tubes were determined by chemical experiments. Solution K-1 contained NiSO4 because when solution K-9, ammonia which was identified by its pungent odor, was added, an inky dark blue color was made. Iron (Fe (NO3)3) was determined to be in test tube K-2. KSCN was found in test tube K-11 since Fe (NO3)3 and KSCN makes a bloody color when mixed together. Flame tests were conducted in which K-8
The compound was tested for the presence of ammonium, carbonate, sulfate, chloride, and nitrate, as seen in Table 2. The nitrate test produced a precipitate, indicating the presence of the nitrate ion in the compound. At this point it was hypothesized that our unknown compound was calcium nitrate.
The goal of the experiment was to identify Unknown 33A and 33B. Unknown 33A was a white, crystalline solid that had a sweet cherry smell and Unknown 33B was a beige, yellowish color liquid that was translucent and had a viscosity similar to water. Also, the liquid was homogenous and smelled sour, similar to mildew.
The main objective of this experiment is to carry out qualitative analysis to identify metal cations in unknown solution 1.
The cations in both the known and unknown samples were identified by using qualitative analysis, of which were determined to be acidic, basic, or neutral by using litmus paper. Acid-base reactions, oxidation-reduction reactions, and the formation of complex ions are often used in a systematic way for either separating ions or for determining the presence of specific ions. When white precipitate formed after adding hydroxide, aluminum ion was determined to be present in the solution. However, nickel was determined to test positive when the solution changed to a hot pink color after adding a few drops of dimethylglyoxime reagent and iron was present when the solution was a reddish brown color when sodium hydroxide was added to the mixture at the very beginning of the experiment. Qualitative analysis determines that ions will undergo specific chemical reactions with certain reagents to yield observable products to detect the presence of specific ions in an aqueous solution where precipitation reactions play a major role. The qualitative analysis of ions in a mixture must add reagents that exploit the more general properties of ions to separate major groups of ions, separate major groups into subgroups with reactions that will distinguish less general properties, and add reagents that will specifically confirm the presence of individual
Step 1 and 2 was repeated by using distilled water by replacing the test solution.