The volume of NaOH used at the equivalence point, pH 7, was 6.575ml. The moles of NaOH used at this point were .0006575mols. Using stochiometry, the moles of HCl were also .0006575 at the equivalence point. Finally, our concentration of HCl was calculated out to be .06575 Molarity.
V. Data
a. General Data
b. Computer Data Graph: See Attached
c. 23Drops From Buret = 1mL
VI. Mathematics
- Stoichiometry
Molarity=Moles/Volume(L)
.5M NaOH=X/.00185L NaOH
X=.00925 mol NaOH
.00925mol NaOH * 1mol HCl/1mol NaOH=.00925mol HCl
.00925mol HCl/.005L = .185M HCl
- Drop Calculations
Vol/Number of Drops.
1mL/23Drops = .034mL/drop
- Conclusion
Unlike other labs, this lab allowed for the most precise titration results possible. The reason for this is that separate drops were entered one at a time and their volume was computed in order to add to the total. However, due to the fact of adding drops one at a time, time became an issue while completing the experiment. One titration took nearly 30minutes in order to complete flawlessly. On the other hand, the results achieved show how slow and steady wins the race.
Another interesting fact about this laboratory exercise is that it was provided us with one of the strongest acid concentrations ever used in an experiment.
The data for this laboratory experiment is as follows. Using a concentration of .1 NaOH we had the largest NaOH volume before the largest pH increase at 6.38ml. For the largest NaOH volume after the largest pH increases we used 6.73ml of base.
The volume of NaOH used at the equivalence point, pH 7, was 6.575ml. The moles of NaOH used at this point were .0006575mols. Using stochiometry, the moles of HCl were also .0006575 at the equivalence point. Finally, our concentration of HCl was calculated out to be .06575 Molarity.
Finally, error in this lab could be derived from many places. Simple human error is a factor in every measurement and liquid transfer which occurred throughout this exercise. Also, computer or incorrectly calibrated apparatus structures can cause data error also. However, the data achieved matches the pre-determined posted set of data, therefore, error was at a low apex.
