Effects Of Combustion Of Magnesium Lab Report
Lab Report 3: Combustion of Magnesium and Specific Heat of a Metal
C4C Jeffrey Silvin
Fall 2017
Major Kittle
Chem 100 T1
Introduction
The purpose of this lab was to determine an experimental value for the heat of formation of MgO with Hess’s Law and then use the result to find percent error. To do so, approximately 50 mL of 1.0 M HCl was added to a calorimeter. Initial temperature was measured and then 0.25 g of Mg was added. After the reaction is completed the maximum temperature was recorded. A similar experiment was performed using approximately 0.50 g of MgO and the same amount of HCl. Using Hess’s Law and the recorded data, the heat of formation for MgO could be experimentally found. After performing the experiment we found the change …show more content…
The first law of thermodynamics says that energy cannot be created or destroyed. In this lab we measured the energy given off in the form of heat to determine other experimental values. We know that heat can be transferred from one object to another in predictable ways. For example, if you leave a piece of hot metal in a room, the metal and the room will reach an equilibrium somewhere in between the two initial temperatures. The measure of the heat transfer is calorimetry, which is what we used in this lab. Lastly, Hess’s Law is used in this lab to take the ΔHrxn of two reactions to form the ΔHrxn of the desired …show more content…
The first is the quality of the calorimeter. With a simple plastic lid, our cheap colorimeter is relatively effective for a low cost but without a proper seal and adequate insulation some of the heat from the reaction was transferred to the surrounding environment instead of the liquid in the cups. This would cause our experimentally collected values of the heat of reaction to be too low. This can be fixed with professional lab equipment. Another source of error is transfer loss of materials. This happens when materials are transferred from one container to another. There will always be some residue that was not completely transferred. To combat this problem, all of the measurements of materials can be performed in the same container the reaction takes place
C4C Jeffrey Silvin
Fall 2017
Major Kittle
Chem 100 T1
Introduction
The purpose of this lab was to determine an experimental value for the heat of formation of MgO with Hess’s Law and then use the result to find percent error. To do so, approximately 50 mL of 1.0 M HCl was added to a calorimeter. Initial temperature was measured and then 0.25 g of Mg was added. After the reaction is completed the maximum temperature was recorded. A similar experiment was performed using approximately 0.50 g of MgO and the same amount of HCl. Using Hess’s Law and the recorded data, the heat of formation for MgO could be experimentally found. After performing the experiment we found the change …show more content…
The first law of thermodynamics says that energy cannot be created or destroyed. In this lab we measured the energy given off in the form of heat to determine other experimental values. We know that heat can be transferred from one object to another in predictable ways. For example, if you leave a piece of hot metal in a room, the metal and the room will reach an equilibrium somewhere in between the two initial temperatures. The measure of the heat transfer is calorimetry, which is what we used in this lab. Lastly, Hess’s Law is used in this lab to take the ΔHrxn of two reactions to form the ΔHrxn of the desired …show more content…
The first is the quality of the calorimeter. With a simple plastic lid, our cheap colorimeter is relatively effective for a low cost but without a proper seal and adequate insulation some of the heat from the reaction was transferred to the surrounding environment instead of the liquid in the cups. This would cause our experimentally collected values of the heat of reaction to be too low. This can be fixed with professional lab equipment. Another source of error is transfer loss of materials. This happens when materials are transferred from one container to another. There will always be some residue that was not completely transferred. To combat this problem, all of the measurements of materials can be performed in the same container the reaction takes place