Sum Of Reaction Lab Report
Table 2 demonstrates the similarity between the value of the sum for Reaction 1 and Reaction 2’s change in temperature, compared to Reaction 3’s change in temperature. Reaction 1 was the dissolution of solid sodium hydroxide in water with a ΔH°rxn of -47047 J/mol, Reaction 2 was the neutralization of liquid sodium hydroxide with HCl with a ΔH°rxn of -31289 J/mol and Reaction 3 was the dissolution and neutralization of solid NaOH with HCl with a ΔH°rxn of -91000 J/mol. Consequently, the sum of Reaction 1 and Reaction 2 was -78336 J/mol, similar to the ΔH°rxn for Reaction 3. Table 2 displays the percent error of the experiment in comparison to the theoretical values, representing that this similarity in values should have been closer; while the
…show more content…
However, the percent error was still relatively low. With a value of 13.4% error as shown in Table 2, there is an accuracy deficiency of an order of magnitude of +/- .1 with 3 significant figures representing the degree of accuracy. The CV% for the difference in the ΔH°rxn for Reaction 3 and the sums of Reactions 1 and 2 is .037, meaning that the error was assessed and it is relatively small. Both values make it still reasonable to say that the experimental data proves Hess’s law to be …show more content…
As shown in Figure 1, the heat inside of the system increased gradually as the exothermic reaction was taking place, while Figure 2 displays heat inside of the system for the exothermic reaction increasing drastically. Therefore, the surface area difference for the solid NaOH versus the liquid NaOH accounted for the speed of the reactions; with solid having less surface area and a slower reaction and liquid having larger surface area and a faster reaction. Figure 3 displays both liquid and solid NaOH being added with a steep slope when the liquid was added and more gradual slope once the solid was added until the heat energy reached equilibrium. Similarly to Reactions 1 and 2, Reaction 3 was an exothermic reaction due to the heat inside of the system increasing. An endothermic reaction is one that absorbs energy in the form of heat by the system from the surrounding. As the system’s absorbs energy in an endothermic reaction it has a positive value for change in enthalpy. However, in these 3 reactions, the change for empathy was negative for each as shown in Table
However, the percent error was still relatively low. With a value of 13.4% error as shown in Table 2, there is an accuracy deficiency of an order of magnitude of +/- .1 with 3 significant figures representing the degree of accuracy. The CV% for the difference in the ΔH°rxn for Reaction 3 and the sums of Reactions 1 and 2 is .037, meaning that the error was assessed and it is relatively small. Both values make it still reasonable to say that the experimental data proves Hess’s law to be …show more content…
As shown in Figure 1, the heat inside of the system increased gradually as the exothermic reaction was taking place, while Figure 2 displays heat inside of the system for the exothermic reaction increasing drastically. Therefore, the surface area difference for the solid NaOH versus the liquid NaOH accounted for the speed of the reactions; with solid having less surface area and a slower reaction and liquid having larger surface area and a faster reaction. Figure 3 displays both liquid and solid NaOH being added with a steep slope when the liquid was added and more gradual slope once the solid was added until the heat energy reached equilibrium. Similarly to Reactions 1 and 2, Reaction 3 was an exothermic reaction due to the heat inside of the system increasing. An endothermic reaction is one that absorbs energy in the form of heat by the system from the surrounding. As the system’s absorbs energy in an endothermic reaction it has a positive value for change in enthalpy. However, in these 3 reactions, the change for empathy was negative for each as shown in Table