A sample of Na2CO3 is known to contain inert matter and either NaOH or NaHCO3. In the potentiometric titration of a 0.225 gram sample with 0.100 N HCl, using a saturated calomel electrode and a hydrogen electrode, the following data were obtained (photo attached) Plot the titration graph and from it determine the nature and approximate composition of the sample.At what volume does the first equivalence point occur? ____ mLAt what volume does the second equivalence point occur? ____ mL Vol HCI (mL)0.005.007.5010.0012.5015.0018.0019.0019.2019.4019.6020.0020.5021.0023.0026.0030.0034.0038.0039.0039.2039.4039.6039.8040.0040.2040.4041.0042.0043.0047.00pH11.710.8410.5810.3610.149.889.419.088.988.858.678.357.937.627.096.716.345.975.395.064.964.834.654.343.883.423.122.722.432.372.23

Given data: Concentration of HCl = 0.1 N mass of mixture of compounds = 0.225 g

Answered: A sample of Na2CO3 is known to contain…

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter1: Chemistry: An Introduction

Section: Chapter Questions

Problem 9STP

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A sample of Na₂CO₃ is known to contain inert matter and either NaOH or NaHCO₃. In the potentiometric titration of a 0.225 gram sample with 0.100 N HCl, using a saturated calomel electrode and a hydrogen electrode, the following data were obtained (photo attached)

Plot the titration graph and from it determine the nature and approximate composition of the sample.

At what volume does the first equivalence point occur? ____ mL
At what volume does the second equivalence point occur? ____ mL

Vol HCI (mL)
0.00
5.00
7.50
10.00
12.50
15.00
18.00
19.00
19.20
19.40
19.60
20.00
20.50
21.00
23.00
26.00
30.00
34.00
38.00
39.00
39.20
39.40
39.60
39.80
40.00
40.20
40.40
41.00
42.00
43.00
47.00
pH
11.7
10.84
10.58
10.36
10.14
9.88
9.41
9.08
8.98
8.85
8.67
8.35
7.93
7.62
7.09
6.71
6.34
5.97
5.39
5.06
4.96
4.83
4.65
4.34
3.88
3.42
3.12
2.72
2.43
2.37
2.23

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