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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

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

World of Chemistry
World of Chemistry
7th Edition
ISBN:9780618562763
Author:Steven S. Zumdahl
Publisher:Steven S. Zumdahl
Chapter10: Energy
Section: Chapter Questions
Problem 36A
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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
Transcribed Image Text: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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