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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

Sketch two graphs: (a) percent dissociation for weak acid HA versus the initial concentration of HA ([HA]0) and(b) H+ concentration versus [HA]0. Explain both.

(a)

Interpretation Introduction

Interpretation: The graph of percent dissociation for weak acid HA versus the initial concentration of HA([HA]0) and H+ concentration versus [HA]0 is to be sketched and has to be explained.

Concept introduction: The acid that contains less number of hydronium ion is known as weak acid.

Explanation

Explanation

To sketch: The plot of percent dissociation for weak acid HA versus the initial concentration of HA([HA]0) .

In the plot of percent dissociation for weak acid HA versus the initial concentration of HA([HA]0) , the percent dissociation decreases with the increase in the initial concentration of weak acid.

The percentage dissociation is the percentage ratio of amount dissociated to the initial concentration, that is,

Percentdissociation=AmountdissociatedInitialconcentartion×100

It is clear from the above equation that percent dissociation is inversely proportional to initial concentration. Higher the value of percent dissociation, lower will be the initial concentration.

The percent dissociation of weak acid is calculated by using the formula,

α=KaC

Where,

  • α is percent dissociation.
  • C is initial concentration

(b)

Interpretation Introduction

Interpretation: The graph of percent dissociation for weak acid HA versus the initial concentration of HA([HA]0) and H+ concentration versus [HA]0 is to be sketched and explained.

Concept introduction: The acid that contains less number of hydronium ion is known as weak acid.

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