I repeated the heating and measuring process 2 more times recording the masses in the data table. I then calculated the mass of the alum by subtracting the final mass of the cup and the alum from the mass of the cup. I then calculated the mass of the water
Hypothesis: Using melting points can help determine the difference in total carbon atoms and branches between two or more compounds. Materials List: 1 Spoon 1 Paper towels 3 Small rubber bands 2 Clean sheets of paper 1 Beaker, 100 mL, glass 1 Burner-fuel 1 Burner-stand 1 Goggles-Safety 1 Magnifier, dual 1 Thermometer-in-cardboard-tube 1 Capillary tubes-3/pack 1 Tetracosane Crystals - 0.2 g in Vial 1 Tetradecanol Crystals - 0.2 g in Vial Procedures: Prior to beginning the lab exercise, read the instructions carefully. Begin by setting up a derivative melting point table to collect the data accumulated during the exercise. This lab uses heated water so be sure to follow safety procedures carefully. While conducting this laboratory experiment, be sure to use minimal amounts of each substance in order to create the habit of using only the amount necessary.
Densities of Solids and Liquids Introduction: In the experiment preformed in class, the objective was to determine the density of a liquid vs. an unknown solid. The idea was to find the measurements of the mass and volume of the substance to determine the amount of each substance that was used during the experiment. In doing the experiment, the order we used to collect our data was first to obtain mass of two coins, then Density of unknown liquid and density of unknown metal. The idea was to start from finding the mass and volume of the empty flask to the mass and volume of the flask with water then with metal and water and after with just the metal and lastly with the unknown liquids. From the data I have done, I would have discovered the precise name of the metal and the name of the unknown liquids that was used to do the experiment.
Kyla Emerine Date of Experiment: April 15, 2015 Report Submitted: August 17, 2015 Title: Colligative Properties and Osmotic Pressure Purpose: To observing changes of colligative properties in freezing and boring points, by adding salt to a solution. Procedure: In this experiment I performed various procedures such as adding different amounts of salt to tap water that was freezing or boiling and observed how it changed the temperatures. Data Tables: Data Table 1. Dialysis Tubing Results Time: |Mass of Dialysis Tubing and Contents | 0 minutes |6.5g| 30 minutes |6.8| 60 minutes |7.2| Questions A. In your experiment, is the light corn syrup in the dialysis tubing hypertonic or hypotonic to the water?
The linear regression model could also be use to approximate the heat of solution. Where finding the heat of solution could be important is when we are trying to figure out the enthalpy change of a solution. Procedure The procedures for this experiment were followed as those printed on pages 221-223 of the manual, experiment number 36 (see references). Deviations in this experiment from the what was printed in the procedure was that Microsoft excel was needed to make the graph instead of using the graph paper provided at the end of the experiment. Data and Results The first eight graphs show the relationship between the temperature of the solution and the nature log of each specific molal concentration.
June 9, 2013 Experiment #1 Laboratory Techniques and Measurements PURPOSE The purpose of this experiment was to learn about the International System of Units. It also was to learn about common utensils used in the laboratory. DATA Object | Length (cm) | Length (mm) | Length (m) | CD | 11.90 | 119 | 0.119 | Key | 7.35 | 73.5 | 0.0735 | Spoon | 15.45 | 154.5 | 0.1545 | Fork | 19.2 | 192 | 0.192 | Water | Temperature (°C) | Temperature (°F) | Temperature (K) | Hot from tap | 40.5 | 104.9 | 313.65 | Boiling | 90.5 | 194.9 | 363.65 | Boiling for 5 min. | 92.0 | 197.6 | 365.15 | Cold from tap | 14.2 | 57.56 | 287.35 | Ice Water – 1 min. | 4.0 | 39.2 | 277.15 | Ice Water – 5 min.
August 23, 2009 Lab Partner-Joey Stabel The Analysis of Alum K.Schuyler Elvir Malikic Purpose Determining and understanding the characteristics of Aluminum Pre-Lab questions 1) When finding a melting point, why is it necessary to raise the temperature very slowly when approaching the melting temperature? When raising the temperature very slowly it gives the thermometer time to display the accurate temperature of the substance giving you a more accurate reading. Another reason would be the visual of things changing in a slower giving you time to examine what’s happening. 2) Washing soda is a hydrated compound whose
Of course the saturated solutions take time this experiment is done in a two day lab setting part one should be completed during the first day and ready for use on day two. Remember because Le Châtelier’s principle if you don’t filter the solution will rise. The removal of OH- from the UN filtered solution will cause more Ca(OH)2 to be dissolved for the equilibrium to restore. The second part of this lab takes knowledge from past experiments done in this laboratory. Using the Primary method used to standardize the concentration of HCl, this will bring much lower percent error in the Ksp For this standardization sodium carbonate should be used for determining the amount of hydroxide in the solution.
Then take jug with room temperature water and pour out three cups into the pot. Before placing it on the stove and heating the water to repeat the experiment, the water temperature was taken to ensure that it was approximate to the room temperature. Literature Review: According to an article in The New York Times, the notion of a body of cold water will reach boiling point quickly as to an identical body of hot water under the same parameters is false (O'Connor, 2008). In this experiment it is not to prove what has already been done, rather to find if the rise of water bodies would be parallel. The notion is to calculate the slope of increase in water temperature given two different starting points, are they both identical.
In addition, the freezing point of the same solution for sugar and salt was compared. The equation: ΔT= iKfm shows the relationship for the freezing point; which ΔT is the change of temperature from the original freezing point, i is the number(s) of particle(s) (van’t Hoff factor), Kf is the freezing point depression constant for the solvent, and m is the molality of solution. The experiment should be able to prove that one of the molalities of sugar solution will equal to the molality of salt. Procedures The experimenters began by calculating the concentrations of each sugar solution (g/mL). Results Information such as data, graphs, calculations, etc.