Report : Experiment 2
Determination of the Percent Purity of KHP in an Unknown Sample
Part 1- Standardization of NaOH Solution
Titration Mass of KHP (g)
Moles KHP
(mol)
Volume NaOH solution used (L)
1 0.7194 0.003523
0.03108
2
3
0.7360
0.7219
0.003604
0.003535
0.02989
0.03171
4 0.7020 0.003437 0.02925
If you ran more than 3 trials, please add rows to this table
Moles of NaOH
(mol)
0.003523
0.003604
0.003535
0.003437
Average Molarity of NaOH
Standard Deviation
0.1157 M NaOH
0.0041 M
Coefficient of Variance
(also known as percent relative standard deviation)
3.5%
Part 2- Determination of the Percent KHP of the Unknown Sample
Unknown sample number: K-35
Titration
Mass of the sample (g)
Volume NaOH solution used
(L)
Moles of
NaOH (mol)
KHP
(mol)
Calculated mass of KHP
(g)
Concentration of NaOH (M)
0.1133
0.1206
0.1115
0.1157
% purity of
KHP
1
2
3
1.2048
1.2020
1.2016
0.01339
0.0134
0.0133
0.001549 0.001549
0.00155
0.00153
If you ran more than 3 trials, please add rows to this table
0.00155
0.00153
Average % KHP in unknown
Standard Deviation
Coefficient of Variance
26.25%
0.08
0.3%
0.3164
0.3166
0.3143
26.26
26.34
26.15
1