Explanation Explanation The indicators that could be used for the titration of HCl and Ba ( OH ) 2 are Phenol red, Bromothymol blue or Cresol red. An indicator is a weak acid that remains in equilibrium with its conjugate base as, HIn ( a q ) + H 2 O ( l ) ⇌ H 3 O + ( a q ) + In − ( a q ) These acid and conjugate base have different colors. When the value of pH is low, at that time the concentration of H 3 O + is high and therefore, equilibrium shifts in the left direction and the color of HIn in the solution. On the other hand, when the value of pH is high, then equilibrium shifts towards the right direction and the solution shows the color of In − . In Exercise 58 a strong acid HCl is titrated with a strong base Ba ( OH ) 2 . As the Ba ( OH ) 2 is added to HCl , the solution starts becoming basic in nature due to the addition of a strong base. Therefore, the indicators used are Phenol red, Bromothymol blue or Cresol red, as they lie in the pH range of 6.7 − 8.2 . Explanation The indicators that could be used for the titration of HNO 3 and H 2 NNH 2 are Methyl red, Bromocresol green

Student Solutions Manual for Zumdahl/Zumdahl/DeCoste?s Chemistry, 10th Edition

10th Edition

ISBN: 9781305957510

Author: ZUMDAHL, Steven S.; Zumdahl, Susan A.; DeCoste, Donald J.

Publisher: Cengage Learning

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Chapter 15, Problem 80E

Interpretation Introduction

Interpretation: The indicators from Figure 14−8 that could be used for titrations in Exercise 58 and 60 are to be stated.

Concept introduction: The acid-base indicators show the color change with change in pH of the solution.

To determine: The indicators from Figure 14−8 that could be used for titrations in Exercise 58 and 60 .

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Chapter 15, Problem 79E

Chapter 15, Problem 81E

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Chapter 15 Solutions

Student Solutions Manual for Zumdahl/Zumdahl/DeCoste?s Chemistry, 10th Edition

Ch. 15 - What is meant by the presence of a common ion? How...Ch. 15 - Define a buffer solution. What makes up a buffer...Ch. 15 - One of the most challenging parts of solving...Ch. 15 - A good buffer generally contains relatively equal...Ch. 15 - Draw the general titration curve for a strong acid...Ch. 15 - Instead of the titration of a strong acid by a...Ch. 15 - Sketch the titration curve for a weak acid...Ch. 15 - Sketch the titration curve for a weak base...Ch. 15 - What is an acidbase indicator? Define the...Ch. 15 - Why does an indicator change from its acid color...

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Solution Summary: The author explains the acid-base indicators from Figure 14-8 that could be used for titrations in Exercise 58 and 60.

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Chapter 15 Solutions