. Consider the titration of the weak acid, benzoic acid, HC;H;O2. Its acid dissociation reaction is: HC>H$O2 (aq) + H:О () C:H$O? (aq) + H30* (aq) A 25.00 mL sample of a solution of benzoic acid, concentration unknown, is titrated with 0.0500M NaOH solution. A plot of the titration is shown below. 12 10 6. 4 5.0 10.0 15.0 volume of 0.0500 M NaOH ml. a) indicate where the equivalence point is, and what is the volume of base added at the equivalence point? b) what is the concentration of the benzoic acid solution (molar units)? c) what is the pKa (approximately) of benzoic acid? its K.? d) on the plot, indicate the buffering region of the titration e) from the pH at the equivalence point, estimate the pK, of benzoate ion (conjugate base to benzoic acid) [Remember, at the equivalence point, C;HO?° (aq) + H2O (1) → HC;H$O2 (aq) + OH- (aq) Hd

. Consider the titration of the weak acid, benzoic acid, HC;H;O2. Its acid dissociation reaction is: HC>H$O2 (aq) + H:О () C:H$O? (aq) + H30* (aq) A 25.00 mL sample of a solution of benzoic acid, concentration unknown, is titrated with 0.0500M NaOH solution. A plot of the titration is shown below. 12 10 6. 4 5.0 10.0 15.0 volume of 0.0500 M NaOH ml. a) indicate where the equivalence point is, and what is the volume of base added at the equivalence point? b) what is the concentration of the benzoic acid solution (molar units)? c) what is the pKa (approximately) of benzoic acid? its K.? d) on the plot, indicate the buffering region of the titration e) from the pH at the equivalence point, estimate the pK, of benzoate ion (conjugate base to benzoic acid) [Remember, at the equivalence point, C;HO?° (aq) + H2O (1) → HC;H$O2 (aq) + OH- (aq) Hd

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

Chapter18: Electrochemistry

Section: Chapter Questions

Problem 18.103QE

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