6.03 Calorimetry Lab

The purpose of the experiment was to determine the molar mass of three unknown solutes by measuring the freezing point depression of a solution containing each of the unknowns. When a solute is dissolved in a solvent, the vapor pressure of the solvent is lowered. As a result of the decrease in the vapor pressure, the colligative properties change.

The main purpose of the lab “Determination of the Formula of a Copper Oxide” was to determine the formula of a copper oxide. Specifically, this is a compound of copper combined with oxygen. This was to be done by heating the copper oxide thoroughly until all of the oxygen had been driven off. To accomplish this experiment, we first had to take and measure the mass of a specified color of copper oxide, ours being red. Then, we used a fischer burner to provide the heat needed for the split of copper oxide, in which our amount resided in a test tube. But, in order for the copper to not recombine with oxygen that could be found in the surrounding atmosphere of our lab, we also had to have a flow of methane gas into the test tube that fed into

The initial circumference of the balloons were 41.5cm. The temperature of the hot water was 58℃, the room temperature water was 25℃ and the cold water was -4℃. After the balloons were placed in the water for 3 minutes, we got our results. The final circumference of the balloon in the hot water was 40.5. It shrank 1cm less which is a surprise since it should expand.

The purpose of Step 8 is to make sure we get the exact mass of the solution. There could be trapped molecules of water in the solution. Heating the solution would evaporate the water molecules.

During my experiment I 've learned a fairly great deal about temperatures, and how to convert Celsius, Fahrenheit, and Kelvin. In my observation I have learned that water boils at 100 degree Celsius, and freezes at 0 degree Celsius.

Using a 5 mL pipet, exactly 5 mL of distilled water was added to each of ten test tubes. The level was marked with a masking tape and the water was poured out. The test tubes were marked to their assigned temperatures (45°C, 40°C, 35°C, 30°C and 27°C).

When measuring the cool tap water in the second part of this experiment, the alcohol thermometer presented a reading of 60.8 F (16 C) and the Proven thermometer produced a reading of 63.1 F (16.3 C). There was not a huge difference between the two readings, given that one is meant to read the infrared wavelengths of the human body.

Introduction Molar mass is a fundamental quantity of chemistry. There are multiple ways to find the molar mass of a substance experimentally; one way is to use Freezing Point Depression by using the following equation: ΔT= kf*m (Robinson, 2018). The purpose of this lab was to do just that; measure the freezing point depression of a solution when a solute is added to a solvent, and from that, determine the molar mass of an unknown substance, along with learning about the influence that solutes have on liquid properties. A concept of importance to this experiment is freezing point. According to LibreTexts, “Freezing point depression is a colligative property observed in solutions that results from the introduction of solute molecules to a solvent…and

Method: Firstly, the experimental apparatus was set up by clamping the Vernier temperature probe directly to a ring stand. For trial 1, the mass of a clean, dry 11-dram vial was recorded to the nearest 0.0001 gram before 15 mL of distilled water were added to the vial and it was weighed again. An ice bath

Introduction Calorimetry is the measurement of heat absorbed or released during a chemical reaction, and in this experiment calorimetry is used to measure the amount of calories in a variety of snack foods. This is related to the saturated fat content of said snack foods. The experiment is done by setting an apparatus to burn each piece of food under a soda can full of water, this is called soda can calorimetry. A unique setup was used to determine the caloric content in each snack food. The foods used were tortilla corn chips, Lays potato chips, Cheetos Puffs, and Doritos.

The molar mass of unknown one at 0.2252 g is 248.29 g/mol, at 0.2252 g it is 248.29 g/mol, and at 0.2482 g, it is 91.25 g/mol. The average molar mass calculated is 205.07 g/mol. There was a jump in the molar mass value at different weight. This could have been due to the experimental errors that occurred during the lab. The graph of the solvent solution initially begins at 23.8˚C but jump down to 10.5˚C. This makes a huge impact on the results of the data because the freezing point should start earlier in time than it shows in the data sheet.

The ranges of sucrose concentration were adequate but could be improved. I propose using values of 0, 0.2, 0.4,

The objective of this experiment was to determine the identification of the unknown copper (II) salt. The unknown salt was found to be copper (II) bromide. A calibration curve for copper (II) sulfate pentahydrate in Trial 1 was found by measuring the absorbance of the four different dilutions and the original solution as shown in Table I. The concentration of each solution was then calculated by multiplying the amount of moles in the original solution by the amount of original solution used in L then dividing by 0.100 L. The concentrations of each solution are shown in Table I. The calibration curve for Trial 1 was created by graphing the concentration on the x axis and the absorbance on the y axis, then finding a line of best fit equation through the origin as shown in Figure 1. This process was repeated to create another table of absorbance and concentrations for each solution for

The purpose of this experiment was determine whether we could fractionally distill a mixture of unknown substances at an unknown concentration? A ml a sample of the unknown substance was heated to find the unknown boiling. The temperature was recorded every 30 seconds. After inputting the results into a graph it was clear there were two plateaus. From the two plateaus it was figured out that there were two different boiling points and two different types of liquids. The 5ml sample was done to determine when to switch the test tubes during the experiment with the 25 ml substance. The test tube would then have to be switched at the end of the first plateau in order to catch only substance 1 and not capture substance 2. The first plateau was 78oc so the test was switched at

The boiling point of water in Fahrenheit is 212 degrees, in Celsius it is 100 degrees.