To begin the experiment, approximately 0.01g of the known solid compound was obtained in a test tube. The relative quantity was then observed and about 1mL of water was added. The test tube was then agitated for approximately twenty seconds and the quantity of solid visible was observed and subsequently contrasted to the original volume. Next, it was determined if any solid appeared to have dissolved in the water. After having determined if the solid dissolved, additional crystals were introduced into the test tube in order to determine if the solid was slightly soluble, soluble or very soluble. If the solid dissolved, the pH of the water was tested using the pH strips and the existent color change or lack there-of was observed. This process
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
Compress the safety bulb, hold it firmly against the end of the pipette. Then release the bulb and allow it to draw the liquid into the pipette.
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).
A: The reaction with water and vinegar was the most useful in this experiment. The physical properties were very self explanatory because the texture of the powders was all different expect icing sugar and cornstarch. Also the Ph levels were very similar of six and seven for corn starch and icing sugar respectively. d) Q: How confident do you feel about your identification of the
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.
I did accomplish the purpose of the lab. First, I determined the percentage of water in alum hydrate, and the percentage of water in an unknown hydrate. The results are reasonable because they are close to the example results. Second, I calculated the water of crystallization of an unknown hydrate. Furthermore, I developed the laboratory skills for analyzing a hydrate.
The purpose of this lab is to see if changing the temperature and the surface area affects the speed of the solute dissolving. This lab relate to the things you have been learning in class because it connects to solubility and how the change in temperature, surface area, and concentration affects the rate in which a substance dissolves. In this lab we hypothesize if we increase the temperature of the vinegar, then the speed of the Alka-Seltzer would increase as well because the speed of the molecules breaking down will be faster. If we also increased the surface area of the Alka-seltzer, it will also dissolve quickly because the pieces are little. In order to complete the surface area experiment, we put our safety goggles on to prevent any
Investigation 20 used spectroscopy along with stoichiometry to determine how much of cobalt was present in a soil sample. The real world application of spectroscopy is endless but one particular scene where spectroscopy is crucial is its application to law enforcement and forensic investigation. While the type of spectroscopy used is different than that used in the laboratory investigation the same basic principles apply. Spectroscopy in its different forms is used to catch the degenerates and is one science that works to make society a better place.
Solid A was identified to be sodium chloride, solid B was identified to be sucrose, and Solid C was identified to be corn starch. Within the Information Chart – Mystery White Solid Lab there are results that distinguishes itself from the other 4 experimental results within each test. Such as: the high conductivity and high melting point of sodium chloride, and the iodine reaction of corn starch. Solid A is an ionic compound due to its high melting point and high electrical conductivity (7), within the Information Chart – Mystery White Solid Lab there is only one ionic compound which is sodium chloride, with the test results of Solid A, it can be concluded that is a sodium chloride. Solid B was identified as sucrose due to its low electrical
3.) Divide your 30g of white substance into the 4 test tubes evenly. You should put 7.5g into each test tube along with the water.
By doing this experiment, I can know the physical and chemical properties of these samples. After I get my results about the physical and chemical properties of these samples, I can compare my results with the information given by the past student and identify the 5 unknown samples, finding out which sample is which substance. Hypothesis = ==
To begin, the Ocean Optics UV/Vis spectrometer was connected to a laptop using the GoLink!, and then logger pro was opened to record the data. Next, the spectrometer was calibrated using a 1cm acrylic cuvette cleaned with deionized water. The cuvette was then filled with deionized water and placed into the sample chamber of the spectrometer. Experiment_Calibrate_Spectrometer: 1 was selected and then 6o seconds passed while the lamp in the spectrometer warmed up. Once the lamp was fully warm, the calibration was finished. The optically clear sides of the cuvette were not touched since that is where the light shines through. The green apple Gatorade was poured into the cuvette carefully, and the absorbance was measured by the spectrometer. The
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.
Introduction: A phase change is a result from the kinetic energy (heat) either decreasing or increasing to change the state of matter (i.e. water, liquid, or gas.) Thus saying, freezing is the phase change from a liquid to a solid which results from less kinetic energy/heat. Also, melting is the phase change from a solid to a liquid which results from adding kinetic energy/heat. So, the freezing and melting point of something is the temperature at which these phase changes occur. Therefore, a phase change will occur when a vial of 10 mL of water is placed into a cup of crushed ice mixed with four spoonfuls with 5 mL of sodium chloride for 30 minutes. If 10 mL of water is placed in an ice bath, it will then freeze at 5 degrees Celsius because the kinetic energy will leave quicker with the ice involved. The purpose of this lab is to observe what temperature the water must be to undergo a phase change.
1. The labels have fallen off of three bottles thought to contain hydrochloric acid, or sodium chloride solution, or sodium hydroxide solution. Describe a simple experiment which would allow you to determine which bottle contains which solution.