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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

You have a solution of the weak acid HA and add some HCl 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 HCl 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 HCl ; 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

Explanation

  • HCl is a strong acid. Hence, it will completely dissociate into H+ and Cl . The weak acid present will not completely ionize. The presence of the H+ 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 .
  • The [HCl] and the Ka value of the weak acid are required for the calculation of the pH of the solution

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