Chemistry 1211K Lab Report
Briana Limage
Drawer #D20
Tuesday December 2, 2014
Lab Day and Time: Tuesday 2-5
Unknown # 4224034-DF14
Introduction
The purpose of this semester long experiment was to determine an unknown organic acid. An organic acid is an organic compound with acidic properties. A base reacts with acids to form salts. Titrations are used to determine the concentration of unknown substances. The purpose of the KHP experiment was to determine the molarity of NaOH. HCl titrations are mainly to check technique and used to verify the molarity of NaOH solution. The hypothesis is that this acid is C4H3OCOOH.
Experimental
Procedure for melting point:
The identification of the melting point of the organic acid was…show more content… (mL)
NaOH Final Vol. (mL)
Total Volume (mL)
Average Molarity of NaOH (M)
Mol NaOH (mol)
Mol HCL in 10.00 mL (mol)
1
1.02
23.30
22.28
0.09998
0.0022
0.0022
2
0.70
23.31
22.61
0.09998
0.0023
0.0023
3
13.74
36.02
22.28
0.09998
0.0022
0.0022
Table 2
Trial
Molarity HCl (M)
Average Molarity HCL (M)
Deviation from average (M)
Average deviation of molarity
Percent deviation from average molarity (%)
1
0.2228
0.2239
0.0011
0.001467
0.6652
2
0.2261
0.2239
0.0022
0.001467
0.6652
3
0.2228
0.2239
0.0011
0.001467
0.6652
Calculations for the molarity of HCl were:
These results were incorrect. The first time the KHP, HCl, and unknown sample titrations were completed, the calculated average molarity was wrong. This was found out when the equivalent weight experiment was completed and the equivalent weight was too low. KHP and the unknown sample titrations were redone to find new average molarity and equivalent weight. HCl titration was not redone.
Unknown Acid: 10 mL deionized water: 10 mL ethanol
Table 1
Trial
Average Molarity NaOH (M)
Mol NaOH in titration (mol)
Mol H+ (mol)
Initial Volume (mL)
Final Volume (mL)
Total Volume (mL)
1
0.08943
0.002780
0.002780
2.41
33.50
31.09
2
0.08943
0.002805
0.002805
2.75
34.12
31.37
3
0.08943
0.002853
0.002853
9.20
41.10
31.90
Table 2
Trial
Mass of organic acid (g)
Mol H+ (mol)
Equivalent weight (g)
Average equivalent weight (g)
Deviation from equivalent weight
Average deviation equivalent weight
1
0.3143
0.002780
