Comparing The Temperature Change, Heat Of Reaction And Enthalpy

Purpose: This laboratory was performed to find the temperature change, heat of reaction, and enthalpy change for neutralization reactions. The temperature change was found by subtracting the initial temperature from the final temperature obtained. Heat of reaction is negative heat of solution. Heat of solution was found by using the formula qsolution = mCsΔT (m= mass; Cs= 4.184 J/g°C; and ΔT = change in temperature). The enthalpy change was found by dividing the heat of reaction by the number of moles of H2O formed.
Procedure:
Experiment 1 was performed after getting a coffee cup calorimeter. A graduated cylinder was used to obtain 50 mL of 0.862M HCl. It was added to the empty coffee cup calorimeter, and its initial temperature was obtained by using the MeasureNet. Using a graduated cylinder, 50 mL of 0.901M NaOH was added into the cup, and the final temperature was obtained. The solution was disposed, and the coffee cup calorimeter was rinsed with distilled water. The next experiments were performed. The acid was always added before the base. Experiment 2 consisted of 100 mL of 0.862M HCl and 100 mL of 0.901M NaOH. Experiment 3
The observed temperature change in experiment 3 was 13.49 °C, which was doubled the one that was given to the HAZMAT team. This change occurred because the concentration of the acid and base increased. The observed temperature change in experiment 4 was 3.30 °C, which was half of the one that was given to the team. This change occurred because the amount of the limiting reagent in this experiment is half of the one that was given to the team. The observed change in experiment 5 was 7.05 °C, which was slightly higher than the one that was given to the team because a different acid was used with different