Lab Report On Calorimetry

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

The purpose of this lab is to figure out the mass percentage of copper in a penny. Furthermore, by doing this lab we will practice using a spectrophotometer and review the names of equipment such as volumetric glassware, pipets, and volumetric flasks. Background: Pennies before 1983 were made with pure copper, while pennies minted after 1983 have a zinc core and a copper shell. The difference between the two types of pennies is the reason why we have to use a penny minted after 1983 for this experiment

Introduction: Calorimetry is defined as the measurement of heat transfer and the amount of heat gained or lost due to chemical reactions, changes of state, or the formation of a solution (Calorimeter 1). The process of calorimetry is conducted inside of a calorimeter (Kieber 27). A calorimeter is an insulated system that thwarts heat exchange from the system to its surroundings (Toolbox 3). The main goal of this experiment is to use calorimetry to determine the specific heat of an unknown metal

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

1. Record the mass of the glass beaker using scale in Data Table 1. 2. Pour approximately 50 mL of room-temperature distilled water into the glass beaker by using the estimated volume on the beaker. 3. Weigh the beaker with water in it, record this value in Data Table 1 and subtract the mass of the beaker to get the mass of the water. Record this value in Data Table 1. 4. Put the burner stand on the pie pan and then place the glass beaker with approximately 50 g of distilled water in it on the burner

solution. Using a variety of mathematical equations and making many calculations, we will precisely plot the cobalt concentrations on multiple graphs with a calorimetry device. We will utilize Beer’s law and a calorimetry device to measure the molarity/concentration of the cobalt (II) solution using light. The primary use of this calorimetry device is to find transmittance (T) and absorption (A), which according to Beers’ law, is directly connected to molarity. The concentration of the unknown solution

Background Brass is considered an alloy, or a mix of multiple metals. Brass is usually made of copper and zinc, but there could be some other metals creating 300+ known brass alloys. The amount of copper in brass will affect basic characteristics of brass like color, strength, conductivity, etc. To find the amount of copper in brass one can use visible spectroscopy. Spectroscopy is the study of electromagnetic radiation. It originated as a study of visible light, and wavelength through a prism

We will be preparing 0.2M sodium acetate and we will begin by weighing 1.64g of sodium acetate (because sodium acetate is hygroscopic, we must keep container tightly closed when not in use). We will then dissolve it in 50ml distilled water by swirling and use a 125ml volumetric flask. Then we will prepare the 0.2M acetic acid by pipetting with a 100-1000 ul micropipettor 1.15ml of acetic acid (concentrated) into another 100ml flask and dilute the volume to 100ml with distilled water. Then we will

Summary Questions: 1. What value(s) of ΔHrxn did you determine? Compare to the literature value. The first trial that contained 10 mL of NaOH and 10 mL of CH3COOH produced a ΔHrxn of -13.11 kJ/m. The second trial, which contained 15 mL of NaOH and 5 mL of CH3COOH resulted in a ΔHrxn of -7.864 kJ/m. Based on the literature value of NaOH CH3COOH, -57.5 kJ/m, we were off by 44.39 kJ/m in the first trial, and 49.64 kJ/m in the second trial. 2. How did concentration and/or volume differences affect

TIME (min) Diffusion of Substance Color (cm) A B 0 0.00 0.00 5 0.40 0.22 10 0.77 0.39 15 1.13 0.57 20 1.47 0.72 25 1.81 0.85 30 2.15 0.98 A study was performed to determine the diffusion rate of two substances. One crystal from each substance was placed in separate medium filled Petri dishes. Substance A has a molecular mass of 164 atomic mass units (amu) and substance B has a molecular mass of 326 amu. ? According to the table, how far could you expect substance A to diffuse in 12.5 minutes