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23.0 mL 4.80 57.0 mL 91.0 mL 24.0 mL 5.77 58.0 mL 92.0 mL 25.0 mL 6.16 59.0 mL 93.0 mL 26.0 mL 6.36 60.0 mL 94.0 mL 27.0 mL 6.54 61.0 mL 95.0 mL 28.0 mL 6.67 62.0 mL 96.0 mL 29.0 mL 6.81 63.0 mL 97.0 mL 30.0 mL 6.92 64.0 mL 98.0 mL 31.0 mL 7.02 65.0 mL 99.0 mL 32.0 mL 7.12 66.0 mL 100.0 mL 33.0 mL 7.22 67.0 mL 101.0 mL Standardization of the NaOH solution Trial 1 Trial 2 Trial 3 Volume of NaOH added 18.2 17.8 18.1 Molarity of the NaOH 6.37x10^-4 1.26x10^-3 1.95x10^-3 Average Molarity of NaOH 1.28x10^-3 Standard deviation Volume of weak acid titrated (mL): 25 (mL) Volume of NaOH added pH measured Volume of NaOH added pH measured Volume of pH measured NaOH added 0.0 mL 1.52 34.0 mL 7.31 68.0 mL 1.0 mL 1.48 35.0 mL 7.42 69.0 mL 2.0 mL 1.45 36.0 mL 7.51 70.0 mL 3.0 mL 1.51 37.0 mL 7.61 71.0 mL 4.0 mL 1.56 38.0 mL 7.72 72.0 mL 5.0 mL 1.61 39.0 mL 7.84 73.0 mL 6.0 mL 1.68 40.0 mL 7.99 74.0 mL 7.0 mL 1.73 41.0 mL 8.14 75.0 mL 8.0 mL 1.79 42.0 mL 8.38 76.0 mL 9.0 mL 1.83 43.0 mL 8.85 77.0 mL 10.0 mL 1.88 44.0 mL 10.14 78.0 mL 11.0 mL 1.94 45.0 mL 11.08 79.0 mL 12.0 mL 2.01 46.0 mL 11.59 80.0 mL 13.0 mL 2.07 47.0 mL 11.83 81.0 mL 14.0 mL 2.15 48.0 mL 12.02 82.0 mL 15.0 mL 2.25 49.0 mL 83.0 mL 16.0 mL 2.32 50.0 mL 84.0 mL 17.0 mL 2.42 51.0 mL 85.0 mL 18.0 mL 2.52 52.0 mL 86.0 mL 19.0 mL 2.66 53.0 mL 87.0 mL 20.0 mL 2.82 54.0 mL 88.0 mL 21.0 mL 3.05 55.0 mL 89.0 mL 22.0 mL 3.42 56.0 mL 90.0 mL

23.0 mL 4.80 57.0 mL 91.0 mL 24.0 mL 5.77 58.0 mL 92.0 mL 25.0 mL 6.16 59.0 mL 93.0 mL 26.0 mL 6.36 60.0 mL 94.0 mL 27.0 mL 6.54 61.0 mL 95.0 mL 28.0 mL 6.67 62.0 mL 96.0 mL 29.0 mL 6.81 63.0 mL 97.0 mL 30.0 mL 6.92 64.0 mL 98.0 mL 31.0 mL 7.02 65.0 mL 99.0 mL 32.0 mL 7.12 66.0 mL 100.0 mL 33.0 mL 7.22 67.0 mL 101.0 mL Standardization of the NaOH solution Trial 1 Trial 2 Trial 3 Volume of NaOH added 18.2 17.8 18.1 Molarity of the NaOH 6.37x10^-4 1.26x10^-3 1.95x10^-3 Average Molarity of NaOH 1.28x10^-3 Standard deviation Volume of weak acid titrated (mL): 25 (mL) Volume of NaOH added pH measured Volume of NaOH added pH measured Volume of pH measured NaOH added 0.0 mL 1.52 34.0 mL 7.31 68.0 mL 1.0 mL 1.48 35.0 mL 7.42 69.0 mL 2.0 mL 1.45 36.0 mL 7.51 70.0 mL 3.0 mL 1.51 37.0 mL 7.61 71.0 mL 4.0 mL 1.56 38.0 mL 7.72 72.0 mL 5.0 mL 1.61 39.0 mL 7.84 73.0 mL 6.0 mL 1.68 40.0 mL 7.99 74.0 mL 7.0 mL 1.73 41.0 mL 8.14 75.0 mL 8.0 mL 1.79 42.0 mL 8.38 76.0 mL 9.0 mL 1.83 43.0 mL 8.85 77.0 mL 10.0 mL 1.88 44.0 mL 10.14 78.0 mL 11.0 mL 1.94 45.0 mL 11.08 79.0 mL 12.0 mL 2.01 46.0 mL 11.59 80.0 mL 13.0 mL 2.07 47.0 mL 11.83 81.0 mL 14.0 mL 2.15 48.0 mL 12.02 82.0 mL 15.0 mL 2.25 49.0 mL 83.0 mL 16.0 mL 2.32 50.0 mL 84.0 mL 17.0 mL 2.42 51.0 mL 85.0 mL 18.0 mL 2.52 52.0 mL 86.0 mL 19.0 mL 2.66 53.0 mL 87.0 mL 20.0 mL 2.82 54.0 mL 88.0 mL 21.0 mL 3.05 55.0 mL 89.0 mL 22.0 mL 3.42 56.0 mL 90.0 mL

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter16: Reactions Between Acids And Bases
Section: Chapter Questions
Problem 16.54QE
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Question

 

Weak Acid titration

1st Equivalence point volume of NaOH added:         _______________

1st Mid-point volume of NaOH added:                      _______________

2nd Equivalence point volume of NaOH added:        _______________

2nd Mid-point volume of NaOH added:                     _______________

pKa1 of the unknown weak acid:                                _______________

Ka1 of the unknown weak acid:                                  _______________

pKa2 of the unknown weak acid:                                _______________

Ka2 of the unknown weak acid:                                  _______________

Concentration of the unknown weak acid, [H2A]:     _______________

(show your work)

23.0 mL 4.80 57.0 mL 91.0 mL 24.0 mL 5.77 58.0 mL 92.0 mL 25.0 mL 6.16 59.0 mL 93.0 mL 26.0 mL 6.36 60.0 mL 94.0 mL 27.0 mL 6.54 61.0 mL 95.0 mL 28.0 mL 6.67 62.0 mL 96.0 mL 29.0 mL 6.81 63.0 mL 97.0 mL 30.0 mL 6.92 64.0 mL 98.0 mL 31.0 mL 7.02 65.0 mL 99.0 mL 32.0 mL 7.12 66.0 mL 100.0 mL 33.0 mL 7.22 67.0 mL 101.0 mL Standardization of the NaOH solution Trial 1 Trial 2 Trial 3 Volume of NaOH added 18.2 17.8 18.1 Molarity of the NaOH 6.37x10^-4 1.26x10^-3 1.95x10^-3 Average Molarity of NaOH 1.28x10^-3 Standard deviation
Transcribed Image Text:23.0 mL 4.80 57.0 mL 91.0 mL 24.0 mL 5.77 58.0 mL 92.0 mL 25.0 mL 6.16 59.0 mL 93.0 mL 26.0 mL 6.36 60.0 mL 94.0 mL 27.0 mL 6.54 61.0 mL 95.0 mL 28.0 mL 6.67 62.0 mL 96.0 mL 29.0 mL 6.81 63.0 mL 97.0 mL 30.0 mL 6.92 64.0 mL 98.0 mL 31.0 mL 7.02 65.0 mL 99.0 mL 32.0 mL 7.12 66.0 mL 100.0 mL 33.0 mL 7.22 67.0 mL 101.0 mL Standardization of the NaOH solution Trial 1 Trial 2 Trial 3 Volume of NaOH added 18.2 17.8 18.1 Molarity of the NaOH 6.37x10^-4 1.26x10^-3 1.95x10^-3 Average Molarity of NaOH 1.28x10^-3 Standard deviation
Volume of weak acid titrated (mL): 25 (mL) Volume of NaOH added pH measured Volume of NaOH added pH measured Volume of pH measured NaOH added 0.0 mL 1.52 34.0 mL 7.31 68.0 mL 1.0 mL 1.48 35.0 mL 7.42 69.0 mL 2.0 mL 1.45 36.0 mL 7.51 70.0 mL 3.0 mL 1.51 37.0 mL 7.61 71.0 mL 4.0 mL 1.56 38.0 mL 7.72 72.0 mL 5.0 mL 1.61 39.0 mL 7.84 73.0 mL 6.0 mL 1.68 40.0 mL 7.99 74.0 mL 7.0 mL 1.73 41.0 mL 8.14 75.0 mL 8.0 mL 1.79 42.0 mL 8.38 76.0 mL 9.0 mL 1.83 43.0 mL 8.85 77.0 mL 10.0 mL 1.88 44.0 mL 10.14 78.0 mL 11.0 mL 1.94 45.0 mL 11.08 79.0 mL 12.0 mL 2.01 46.0 mL 11.59 80.0 mL 13.0 mL 2.07 47.0 mL 11.83 81.0 mL 14.0 mL 2.15 48.0 mL 12.02 82.0 mL 15.0 mL 2.25 49.0 mL 83.0 mL 16.0 mL 2.32 50.0 mL 84.0 mL 17.0 mL 2.42 51.0 mL 85.0 mL 18.0 mL 2.52 52.0 mL 86.0 mL 19.0 mL 2.66 53.0 mL 87.0 mL 20.0 mL 2.82 54.0 mL 88.0 mL 21.0 mL 3.05 55.0 mL 89.0 mL 22.0 mL 3.42 56.0 mL 90.0 mL
Transcribed Image Text:Volume of weak acid titrated (mL): 25 (mL) Volume of NaOH added pH measured Volume of NaOH added pH measured Volume of pH measured NaOH added 0.0 mL 1.52 34.0 mL 7.31 68.0 mL 1.0 mL 1.48 35.0 mL 7.42 69.0 mL 2.0 mL 1.45 36.0 mL 7.51 70.0 mL 3.0 mL 1.51 37.0 mL 7.61 71.0 mL 4.0 mL 1.56 38.0 mL 7.72 72.0 mL 5.0 mL 1.61 39.0 mL 7.84 73.0 mL 6.0 mL 1.68 40.0 mL 7.99 74.0 mL 7.0 mL 1.73 41.0 mL 8.14 75.0 mL 8.0 mL 1.79 42.0 mL 8.38 76.0 mL 9.0 mL 1.83 43.0 mL 8.85 77.0 mL 10.0 mL 1.88 44.0 mL 10.14 78.0 mL 11.0 mL 1.94 45.0 mL 11.08 79.0 mL 12.0 mL 2.01 46.0 mL 11.59 80.0 mL 13.0 mL 2.07 47.0 mL 11.83 81.0 mL 14.0 mL 2.15 48.0 mL 12.02 82.0 mL 15.0 mL 2.25 49.0 mL 83.0 mL 16.0 mL 2.32 50.0 mL 84.0 mL 17.0 mL 2.42 51.0 mL 85.0 mL 18.0 mL 2.52 52.0 mL 86.0 mL 19.0 mL 2.66 53.0 mL 87.0 mL 20.0 mL 2.82 54.0 mL 88.0 mL 21.0 mL 3.05 55.0 mL 89.0 mL 22.0 mL 3.42 56.0 mL 90.0 mL
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