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You have a solution of the weak acid HA and add some of the salt NaA to it. What are the major species in the solution? What do you need to know to calculate the pH of the solution, and how would you use this information? How does the pH of the solution of just the HA compare with that of the final mixture? Explain.

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Chemistry

10th Edition
Steven S. Zumdahl + 2 others
Publisher: Cengage Learning
ISBN: 9781305957404

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Chapter
Section
BuyFindarrow_forward

Chemistry

10th Edition
Steven S. Zumdahl + 2 others
Publisher: Cengage Learning
ISBN: 9781305957404
Chapter 15, Problem 8ALQ
Textbook Problem
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You have a solution of the weak acid HA and add some of the salt NaA to it. What are the major species in the solution? What do you need to know to calculate the pH of the solution, and how would you use this information? How does the pH of the solution of just the HA compare with that of the final mixture? Explain.

Interpretation Introduction

Interpretation:

The major species present in the solution containing a mixture of a weak acid (HA) and a salt NaA are to be stated. The quantity needed for the calculation of pH is to be determined. The comparison between the pH of the solution of just the HA with that of the final mixture is to be explained.

Concept introduction:

A strong acid completely dissociates in water.

To determine: The major species present in the solution containing a mixture of a weak acid (HA) and a salt NaA ; the quantity needed for the calculation of pH and the comparison between the pH of the solution of just the HA with that of the final mixture.

Explanation of Solution

Explanation

  • On the addition of NaA to the solution of HA , the dissociation of NaA into Na+ and A ions takes place. The weak acid present will not completely ionize. The presence of the Cl ions in the solution will hinder the ionization of the weak acid (due to common ion effect).  Therefore, the major species present are H+,Cl,HA and H2O

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