Calorimetry: Hess's Law Essay

897 words - 4 pages

REFERENCE
General Chemistry for Engineering and Science II- pages 79-94

OBJECTIVES
To practice obtaining measurements of calorimetry and to employ the data to demonstrate Hess’s Law of combining reaction enthalpies.

QUESTION
Did your experiment demonstrate Hess’s Law of heat summation?

DISCUSSION
For this experiment we have to know what Calorimetry, exothermic, endothermic, Hess’s Law, and calorimeter are. Calorimetry is the measurement of the quantity of heat exchanged. Exothermic is a chemical reaction where heat is produced, while endothermic is a chemical reaction where heat is absorbed. Hess’s Law is the heat change in a chemical reaction which is the same regardless of the number ...view middle of the document...

6〗^O C which was recorded at the final time of seven minutes and the contents of the container remained clear.
Next in Phase B: Heat of Solution ΔH_S which also had four steps and it started with 2.0g of solid NaOH pellets being weighted out and placed in a test tube and then 50mL of distilled water was measured out and placed in a clean calorimeter. The distilled water was clear and the NaOH pellets had a white tint to it. Then from minute 1-4 the temperature of the distilled water was 〖22.4〗^O C then the temperature began to rise after the NaOH pellets were placed into the calorimeter containing the distilled water. The final temperature was 〖32.5〗^O C which was recorded at the final time of seven minutes and the contents of the container were clear and the pellets dissolved completely.
Lastly in Phase C: Heat of Reaction ΔH_R had seven steps and it started with 2.0g of solid NaOH pellets being weighted out and placed in a test tube and then distilled water was added to 55mL of 1.0M HCl until there was a total of 100mL of solution. The HCl was clear and the NaOH pellets had a white tint to it. The HCl solution was poured into a clean calorimeter and from minute 1-4 the temperature was 〖23.1〗^O C then the temperature began to rise after the NaOH pellets were placed into the calorimeter containing the HCl solution. The final temperature was 〖32.9〗^O C which was recorded at the final time of seven minutes...

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