   Chapter 15, Problem 114CP

Chapter
Section
Textbook Problem

# Consider the following two acids:     p K a i = 2.98 ;   p K a j = 13.40 HO 2 CCH 2 CH 2 CH 2 CH 2 CO 2 H Adipic acid p K a i   =   4.41 ;   p K a j = 5.28 In two separate experiments the pH w as measured during the titration of 5.00 mmol of each acid with 0.200 M NaOH. Each experiment showed only one stoichiometric point when the data were plotted. In one experiment the stoichiometric point was at 25.00 mL added NaOH, and in the other experiment the stoichiometric point was at 50.00 mL NaOH. Explain these results. (See Exercise 113.)

Interpretation Introduction

Interpretation:

The reason for one stoichiometric point in both the experiments is to be justified.

Concept introduction:

Titration is a technique used in quantitative analytical chemistry to determine the concentration of an unknown solution (analyte) by treating it with a solution of known concentration (titrant).  The known solution is added slowly through a burette into the analyte and reaction start taking place.  An indicator is also used to signal the end-point or the equivalence point of the reaction.  The titration curves where the x coordinates measures the volume of the titrant added and the y coordinates measures the concentration of analyte, is drawn to know the equivalence point.

Explanation

To determine: The pH of two different experiments were measured during the titration of 5.0mmol Salicylic acid and Adipic acid with 0.200MNaOH .  The reason for one stoichiometric point in both the experiments.

The pKa values of Adipic acid are 4.41,5.28 .

The pKa values of Salicylic acid are 2.98,13.40

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