Concept explainers
Interpretation:
The pH value of the given solution is to be calculated which is buffered by benzoic acid and sodium benzoate.
Concept introduction:
A buffer solution is a solution in which no change in pH takes place on adding a small amount of acid and base.
The value of the acid ionization constant tells about the state of whether reactants or products are more favored in the reaction.
For a reaction,
HA+H2O⇌A−+H3O+
Acid ionization constant is given by:
ka=[A−]×[H3O+][HA]
where,
[A−] is concentration of A−
[H3O+]is concentration of H3O+
[HA]is concentration of HA

Answer to Problem 103A
pH=4.19
Explanation of Solution
Benzoic acid and sodium benzoate dissociate as:
C6H5COOH⇌H++C6H5COO−
C6H5COONa→Na++C6H5COO−
ka=[C6H5COO−]×[H+][C6H5COOH]
Given data:
ka=6.4×10−5
[C6H5COO−]=0.0500 M
[C6H5COOH]=0.0500 M
Therefore,
[H+]=6.4×10−5×0.050.05
=6.4×10−5 M
pH=−log(6.4×10−5)
=−log6.5−log10−5
=−0.81+5
=4.19
Thus pH value of given solution is 4.19
Chapter 18 Solutions
Chemistry: Matter and Change
Additional Science Textbook Solutions
Organic Chemistry (8th Edition)
Applications and Investigations in Earth Science (9th Edition)
Campbell Biology (11th Edition)
Biology: Life on Earth (11th Edition)
College Physics: A Strategic Approach (3rd Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
- Identifying electron-donating and For each of the substituted benzene molecules below, determine the inductive and resonance effects the substituent will have on the benzene ring, as well as the overall electron-density of the ring compared to unsubstituted benzene. Molecule Inductive Effects NH2 ○ donating NO2 Explanation Check withdrawing no inductive effects Resonance Effects Overall Electron-Density ○ donating O withdrawing O no resonance effects O donating O withdrawing O donating withdrawing O no inductive effects Ono resonance effects O electron-rich electron-deficient O similar to benzene O electron-rich O electron-deficient O similar to benzene olo 18 Ar 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibilityarrow_forwardRank each of the following substituted benzene molecules in order of which will react fastest (1) to slowest (4) by electrophilic aromatic substitution. Explanation Check Х (Choose one) OH (Choose one) OCH3 (Choose one) OH (Choose one) © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Centerarrow_forwardAssign R or S to all the chiral centers in each compound drawn below porat bg 9 Br Brarrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY





