6.03 Calorimetry Lab

Approximately 40 mL of the ionized water was added to the 100 mL beaker, then in a 10-mL graduated cylinder, 5-mL of HCl was measured then added to the 100-mL beaker of water. The 100 mL beaker was then placed on the assembled ring stand.
Approximately 40 mL of the 0.1M NaOH was added to the 250 mL beaker. The 40-mL of NaOH was then added to the buret which was then attached to the ring stand.
The LabQuest and the Vernier pH sensor was then hooked up and turned on to measure and graph the pH of the solution and the volume of NaOH. The Vernier pH sensor was then was placed in the solution and remained in the solution throughout the duration of the experiment.
Then, the rate of the drip from the buret was then turned on to have a drip rate of
approximately one drip per second.
As the NaOH began to drip into the HCl acid solution, it was stirred with the magnetic stirrer. It was quickly observed that the graph that measured pH and volume of NaOH began to rise. As the pH began to rise, it was thought that the equivalence point was reached in which the buret was then turned off. It was then identified that the titration was stopped too early in which the pH of the solution was approximately two.
As a consequence of this the process had to be repeated.
The solution of NaOH, water and HCl in the 100-mL was poured into the proper waste container. The solution of 40-mL of water and 5-mL of HCl was prepared again in the same 100-mL beaker and placed under the
buret.
The Vernier pH sensor was then placed and held in the 100-mL beaker again, the LabQuest was then reset to have a new graph and to record the pH again.
The buret was turned back on with a rate of approximately one drop per second in which the solution was stirred with the magnetic stirrer as the NaOH was titrated into the solution.
As the LabQuest was plotting the graph and the volume of NaOH was increasing as it was added to the HCl solution, it was discovered that the LabQuest malfunctioned and stopped at the pH of two. The pipette was then turned off again and the TA was then notified in which it was then fixed.
The solution containing the HCl, NaOH and water in the 100-mL was then disposed into the proper waste container. In the same 100-mL beaker, 40-mL of water was added then 5-mL of HCl was also added. The Vernier pH sensor was again placed and held in the solution and the LabQuest was properly programmed and turned on.
The buret was then turned on again, with a rate of approximately one drop per second and the solution was stirred as NaOH was added.
The proper graph was created while the NaOH was titrated into the HCl and water solution, in which the equivalence point was displayed on the graph and
determined.
The volume before and after the largest pH increase was recorded as well as the volume at the equivalence point.