# Calorimetry

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Enthalpy of Dehydration of Sodium Acetate Trihydrate Purpose: In this lab, two solid substances, sodium acetate and sodium acetate trihydrate, will be analyzed for the heat of solution for both processes. This allowed the calculation of the molar enthalpy of dehydration of sodium acetate trihydrate. Calorimetry was used to experimentally determine the heat of solution for both reactions. Procedure: This lab was performed based on the procedure outlined in “Exp #7 Calorimetry.” No changes to the procedure were made. Data and Observations: All data and observations were recorded in the lab notebook. Pages from the lab notebook are attached to the lab. Results…

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The objective of the lab was to find the calorie content of Cheetos and marshmallows. To do this we needed to use a calorimeter. The hypothesis was that Cheetos would have more calories because they have more fat in them. The Cheetos and marshmallows were lit and put in an oatmeal can calorimeter. The temputure change in the water leads to finding the calories in food. Cheetos had about 3x the amount of calories at 1.66 calories per gram compared to marshmallows 0.57 calories per gram. With this…

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B. Equipment: - a calibrated thermometer -a scale -two styrofoam cups -a chunk of metal that weighs at least 30 grams -boiling water -kitchen tongs -safety goggles C. Procedures: 1. Heat water in a pan or beaker until it is boiling vigorously. 2. Measure the mass of the metal with the scale. 3. Drop metal into boiling water, and let it sit for for about five minutes. 4. Place the two styrofoam cups inside each other. 5. Measure the mass of the calorimeter, and then fill it ¾ full of room…

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Introduction: The goal of this lab was for students to learn how to use a spectrophotometer to find the absorbance of four known copper (II) sulfate solutions, four copper (II) sulfate solutions that were created by dilution, and one unknown copper (II) sulfate solution. The purpose of this experiment was to help students learn how to use the Spec-20, which is a machine that measures the transmittance and absorbance of a solution, learn about the linear relationship between absorbance and…

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Procedure: Part A: Extraction stage 1. Place a 125 mL separatory funnel in a ring stand equipped with a small ring. 2. Heat the hot plate. 3. Heat the water (20 mL of hot water is needed) to a boil by placing it on top of the hot plate. 2. To the 125 mL Erlenmeyer flask, added two Tylenol (500 mg/ tablet) 3. Dissolved the solid by gently swirling the Erlenmeyer flask. 4. Let the solution cool for a few minutes (approximately till room temperature). 5. Add the mixture to the separatory funnel.…

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Abstract The goal of this experiment is to understand the theory behind bomb calorimetry and use it to determine the enthalpy of combustion of naphthalene. First, the bomb calorimeter was standardized using benzoic acid and the average heat capacity of the bomb calorimeter was calculated to be 10.60.3205 kJ/K. From that, the average m, and f were found to be -526615.66kJ/mol, with a percent difference of 3.31%, -52600.0015kJ/mol with a percent difference of 1.99%, and -185.50.0013kJ/mol with a…

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Brooke Beams February 2, 2012 Experiment 1 Determination of the Components of a “Mixed Drink” INTRODUCTION. For this experiment standard solutions of Kool-Aid flavors will be prepared to measure the absorbance at lambda max and plot the results against the concentration of solution to generate a standard curve. Then it must be determined the amount of each flavor in a sample of the unknown by comparison to your standard curves. The ingredient in each flavor of the Kool-Aid that…

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Determining the Percentage Yield of a Chemical Reaction Question: What is the percentage yield of the reaction of sodium carbonate and calcium chloride dihydrate (the dihydrate must be included with the molar mass calculation)? Predictions: Predict the mass of sodium carbonate and calcium chloride dihydrate that will be required to produce 1.90 grams of calcium carbonate: Therefore, the predicted mass of sodium carbonate is 2.0 grams and the predicted mass of…

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Summary: This lab involves three separate experiments. Before you conduct any of them, however, you should put on goggles and aprons, as well as gloves. For the first part, place the FeCl3 solution into the watch glass, and add a few drops of KSCN. Record any changes you might see. Then, ask Dr. Karraker to add a KSCN crystal to the watch glass, and again record any changes. Add drops of Na3PO3 and record any changes, then add FeCl3 and record those changes too. After you are done, dump the…

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In the volume lab, we found that the large graduated cylinder was the most accurate because it had less percent error when measuring the density of water over all of the other measuring tools.In this lab, we measured water from pipettes including volumetric and graduated pipettes, graduated cylinders, erlenmeyer flasks, and beakers to figure out the mass and density. These measurements were then used to calculate the percent error. We completed these measurements by measuring the volume of the…

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