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18mL of the diluted solution (S1) are transferred into a 250 ml beaker, then titrated with a solution of HCl of concentration C, = 0.018 mole/L. Using a pH-meter we follow the change of the pH of the mixture as a function of V. (the volume of acid added). The following results are tabulated: V, in ml 2 7 8.5 8.7 8.9 9.1 9.3 | 9.5 | 10 | 11 | 13 15 pH 12 11.8 11.6 11.3 11 10.5 | 10.2 9.2 7 5 4 3.7 3.2 2.7 2.4 | 2.3 2.1- Indicate a convenient glassware that must be used to : 2.1.1 - Withdraw the volume of solution S, . 2.1.2- Add HCI solution 2.2-Write the equation of the titration reaction, list its characteristics. 2.3- Plot the curve pH = f(Va) abscissa 1 cm 1 ml and ordinate 1cm 1 pH units 2.4- Determine graphically the coordinates of equivalence point

18mL of the diluted solution (S1) are transferred into a 250 ml beaker, then titrated with a solution of HCl of concentration C, = 0.018 mole/L. Using a pH-meter we follow the change of the pH of the mixture as a function of V. (the volume of acid added). The following results are tabulated: V, in ml 2 7 8.5 8.7 8.9 9.1 9.3 | 9.5 | 10 | 11 | 13 15 pH 12 11.8 11.6 11.3 11 10.5 | 10.2 9.2 7 5 4 3.7 3.2 2.7 2.4 | 2.3 2.1- Indicate a convenient glassware that must be used to : 2.1.1 - Withdraw the volume of solution S, . 2.1.2- Add HCI solution 2.2-Write the equation of the titration reaction, list its characteristics. 2.3- Plot the curve pH = f(Va) abscissa 1 cm 1 ml and ordinate 1cm 1 pH units 2.4- Determine graphically the coordinates of equivalence point

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.132QP: A quantity of 0.15 M hydrochloric acid is added to a solution containing 0.10 mol of sodium acetate....
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2) Titration of the diluted solution with hydrochloric acid 18ml of the diluted solution (S,) are transferred into a 250 ml beaker, then titrated with a solution of HCl of concentration C, = 0.018 mole/L. Using a pH-meter we follow the change of the pH of the mixture as a function of V. (the volume of acid added). The following results are tabulated: V, in ml 2 5 7 8 8.5 8.7 8.9 9. 9.1 9.3 9.5 10 11 13 15 pH 12 11.8 11.6 11.3 11 10.5 10.2 | 9.2 7 4 3.7 3.2 2.7 2.4 | 2.3 2.1- Indicate a convenient glassware that must be used to : 2.1.1 - Withdraw the volume of solution S, . 2.1.2- Add HCI solution 2.2-Write the equation of the titration reaction, list its characteristics. 2.3- Plot the curve pH = f(Va) abscissa 1 cm 1 ml and ordinate 1cm 1 pH units 2.4- Determine graphically the coordinates of equivalence point 2.5- Based on the chemical species present in the beaker, justify the value of the pH at equivalence point. 2.6- Determine the molar concentration of solution (S,). 2.7- Deduce the concentration of (S.). 2.8- Find the relation between PH, Va, Vb, Ca, Cs and Vwater added after the equivalence. 2.9-To achieve a more rapid determination of the PH at equivalence, we could perform a colorimetric assay. Specify the best indicator to choose from those listed in the table below: indicator PH range of color change belianthin 3,1 - 4,4 bromothymol blue 6 -7,6 Cresol red 7,2 - 8,8
Transcribed Image Text:2) Titration of the diluted solution with hydrochloric acid 18ml of the diluted solution (S,) are transferred into a 250 ml beaker, then titrated with a solution of HCl of concentration C, = 0.018 mole/L. Using a pH-meter we follow the change of the pH of the mixture as a function of V. (the volume of acid added). The following results are tabulated: V, in ml 2 5 7 8 8.5 8.7 8.9 9. 9.1 9.3 9.5 10 11 13 15 pH 12 11.8 11.6 11.3 11 10.5 10.2 | 9.2 7 4 3.7 3.2 2.7 2.4 | 2.3 2.1- Indicate a convenient glassware that must be used to : 2.1.1 - Withdraw the volume of solution S, . 2.1.2- Add HCI solution 2.2-Write the equation of the titration reaction, list its characteristics. 2.3- Plot the curve pH = f(Va) abscissa 1 cm 1 ml and ordinate 1cm 1 pH units 2.4- Determine graphically the coordinates of equivalence point 2.5- Based on the chemical species present in the beaker, justify the value of the pH at equivalence point. 2.6- Determine the molar concentration of solution (S,). 2.7- Deduce the concentration of (S.). 2.8- Find the relation between PH, Va, Vb, Ca, Cs and Vwater added after the equivalence. 2.9-To achieve a more rapid determination of the PH at equivalence, we could perform a colorimetric assay. Specify the best indicator to choose from those listed in the table below: indicator PH range of color change belianthin 3,1 - 4,4 bromothymol blue 6 -7,6 Cresol red 7,2 - 8,8
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