Connect 1-Semester Online Access for Principles of General, Organic & Biochemistry
2nd Edition
ISBN: 9780077633707
Author: Janice Smith
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 8, Problem 8.93AP
Interpretation Introduction
Interpretation:
The reason why
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If a buffer solution is made from 300.0 mL of 1.6 M aniline salt mixed with 250.0 mL of 2.0 M aniline, calculate the following:
The initial pH of the buffer solution.
The pH of the solution if 10.0 mL of 0.300 M HCl is added to the buffered solution.
The pH of the solution if 10.0 mL of 0.300 M NaOH is added to the buffered solution.
How does a buffer solution prevent larger change in pH? What does it mean when a solution has exceeded the buffer capacity?
8.When a small amount of 12 M HNO3(aq) is added to a buffer solution made by mixing CH3NH2(aq) and CH3NH3Cl(aq), the pH of the buffer solution changes from 10.64 to 10.62. Which of the following equations represents the reaction that accounts for the fact that the pH does not change significantly when the HNO3(aq) is added?
a) CH3NH2(aq) + H+(aq) → CH3NH3+(aq)
b)CH3NH3+(aq) + H+(aq) → CH3NH42+(aq)
c) NO3- (aq) + H+(aq) → HNO3(aq)
d) OH- (aq) + H+(aq) → H2O(l)
Chapter 8 Solutions
Connect 1-Semester Online Access for Principles of General, Organic & Biochemistry
Ch. 8.1 - Name each acid: (a) HF; (b) HNO3; (c) HCN.Ch. 8.1 - Prob. 8.2PCh. 8.1 - Which of the following species can be BrnstedLowry...Ch. 8.1 - Which of the following species can be BrnstedLowry...Ch. 8.1 - Classify each reactant as a BrnstedLowry acid or...Ch. 8.2 - Draw the conjugate acid of each species: (a) H2O;...Ch. 8.2 - Draw the conjugate base of each species: (a) H2S;...Ch. 8.2 - Draw the structure of the conjugate base of each...Ch. 8.2 - Label the acid and the base and the conjugate acid...Ch. 8.2 - Ammonia, NH3, is amphoteric. (a) Draw the...
Ch. 8.2 - When ascorbic acid (vitamin C, molecular formula...Ch. 8.3 - Prob. 8.12PCh. 8.3 - Prob. 8.13PCh. 8.3 - Prob. 8.14PCh. 8.3 - Prob. 8.15PCh. 8.4 - Calculate the value of [OH] from the given [H3O+]...Ch. 8.4 - Calculate the value of [H3O+] from the given [OH]...Ch. 8.4 - Calculate the value of [H3O+] and [OH] in each...Ch. 8.5 - Convert each H3O+ concentration to a pH value. a....Ch. 8.5 - What H3O+ concentration corresponds to each pH...Ch. 8.5 - Prob. 8.21PCh. 8.5 - Prob. 8.22PCh. 8.6 - Write a balanced equation for each acidbase...Ch. 8.6 - Prob. 8.24PCh. 8.6 - Prob. 8.25PCh. 8.6 - Write a balanced equation for the reaction of...Ch. 8.7 - Prob. 8.27PCh. 8.7 - Prob. 8.28PCh. 8.8 - Prob. 8.29PCh. 8.8 - Prob. 8.30PCh. 8 - Draw the structure of the conjugate base of each...Ch. 8 - Draw the structure of the conjugate base of each...Ch. 8 - (a) Which of the following represents a strong...Ch. 8 - Prob. 8.34UKCCh. 8 - Identify the acid, base, conjugate acid, and...Ch. 8 - Prob. 8.36UKCCh. 8 - Prob. 8.37UKCCh. 8 - Prob. 8.38UKCCh. 8 - Prob. 8.39UKCCh. 8 - Prob. 8.40UKCCh. 8 - If a urine sample has a pH of 5.90, calculate the...Ch. 8 - Prob. 8.42UKCCh. 8 - Prob. 8.43UKCCh. 8 - Prob. 8.44UKCCh. 8 - Consider a buffer prepared from the weak acid HNO2...Ch. 8 - Prob. 8.46UKCCh. 8 - Prob. 8.47APCh. 8 - Prob. 8.48APCh. 8 - Prob. 8.49APCh. 8 - Prob. 8.50APCh. 8 - Prob. 8.51APCh. 8 - Prob. 8.52APCh. 8 - Draw the conjugate base of each acid. a. HNO2 b....Ch. 8 - Draw the conjugate base of each acid. a. H3O+ b....Ch. 8 - Prob. 8.55APCh. 8 - Prob. 8.56APCh. 8 - Prob. 8.57APCh. 8 - Like H2O, H2PO4 is amphoteric. (a) Draw the...Ch. 8 - Prob. 8.59APCh. 8 - Prob. 8.60APCh. 8 - Prob. 8.61APCh. 8 - Prob. 8.62APCh. 8 - Prob. 8.63APCh. 8 - Prob. 8.64APCh. 8 - Prob. 8.65APCh. 8 - Prob. 8.66APCh. 8 - Prob. 8.67APCh. 8 - Prob. 8.68APCh. 8 - Calculate the value of [OH] from the given [H3O+]...Ch. 8 - Calculate the value of [OH] from the given [H3O+]...Ch. 8 - Calculate the value of [H3O+] from the given [OH]...Ch. 8 - Prob. 8.72APCh. 8 - Prob. 8.73APCh. 8 - Calculate the pH from each H3O+ concentration...Ch. 8 - Prob. 8.75APCh. 8 - Prob. 8.76APCh. 8 - What are the concentrations of H3O+ and OH in...Ch. 8 - Prob. 8.78APCh. 8 - Prob. 8.79APCh. 8 - Prob. 8.80APCh. 8 - Prob. 8.81APCh. 8 - Prob. 8.82APCh. 8 - Prob. 8.83APCh. 8 - Prob. 8.84APCh. 8 - Prob. 8.85APCh. 8 - Prob. 8.86APCh. 8 - Prob. 8.87APCh. 8 - Prob. 8.88APCh. 8 - Consider a weak acid H2A and its conjugate base...Ch. 8 - Consider a weak acid H2A and its conjugate base...Ch. 8 - Prob. 8.91APCh. 8 - Prob. 8.92APCh. 8 - Prob. 8.93APCh. 8 - Prob. 8.94APCh. 8 - The optimum pH of a swimming pool is 7.50....Ch. 8 - A sample of rainwater has a pH of 4.18. (a)...Ch. 8 - Prob. 8.97APCh. 8 - Prob. 8.98APCh. 8 - Prob. 8.99APCh. 8 - Explain why a lake on a bed of limestone is...Ch. 8 - Prob. 8.101CP
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- Using the diagrams shown in Problem 10-117, which of the solutions would have the greatest buffer capacity, that is, greatest protection against pH change, when the following occurs? a. A strong acid is added to the solution. b. A strong base is added to the solution.arrow_forwardWhat is a salt? List some anions that behave as weak bases in water. List some anions that have no basic properties in water. List some cations that behave as weak acids in water. List some cations that have no acidic properties in water. Using these lists, give some formulas for salts that have only weak base properties in water. What strategy would you use to solve for the pH of these basic salt solutions? Identify some salts that have only weak acid properties in water. What strategy would you use to solve for the pH of these acidic salt solutions? Identify some salts that have no acidic or basic properties in water (produce neutral solutions). When a salt contains both a weak acid ion and a weak base ion, how do you predict whether the solution pH is acidic, basic, or neutral?arrow_forwardA buffer solution has a pH value of 9.8. Which value in the set of pH values 8.79.79.89.910.9 is the most likely value for the buffer solution pH after a. a small amount of strong acid has been added? b. a small amount of strong base has been added?arrow_forward
- Two strategies are also followed when solving for the pH of a base in water. What is the strategy for calculating the pH of a strong base in water? List the strong bases mentioned in the text that should be committed to memory. Why is calculating the pH of Ca(OH)2 solutions a little more difficult than calculating the pH of NaOH solutions? Most bases are weak bases. The presence of what element most commonly results in basic properties for an organic compound? What is present on this element in compounds that allows it to accept a proton? Table 13-3 and Appendix 5 of the text list Kb values for some weak bases. What strategy is used to solve for the pH of a weak base in water? What assumptions are made when solving for the pH of weak base solutions? If the 5% rule fails, how do you calculate the pH of a weak base in water?arrow_forwardEstimate the pH that results when the following two solutions are mixed. a) 50 mL of 0.3 M CH3COOH and 50 mL of 0.4 M KOH b) 100 mL of 0.3 M CH3COOH and 50 mL of 0.4 M NaOH c) 150 mL of 0.3 M CH3COOH and 100 mL of 0.3 M Ba(OH)2 d) 200 mL of 0.3 M CH3COOH and 100 mL of 0.3 M Ba(OH)2arrow_forwardFour different substances of the generalized formula HA were dissolved in water, with the results shown in the diagrams. Which of the diagrams represents the substance that is the strongest electrolyte?arrow_forward
- Two samples of 1.00 M HCl of equivalent volumes are prepared. One sample is titrated to the equivalence point with a 1.00 M solution of sodium hydroxide, while the other sample is titrated to the equivalence point with a 1.00 M solution of calcium hydroxide. a Compare the volumes of sodium hydroxide and calcium hydroxide required to reach the equivalence point for each titration. b Determine the pH of each solution halfway to the equivalence point. c Determine the pH of each solution at the equivalence point.arrow_forwardAn aqueous solution contains formic acid and formate ion. Determine the direction in which the pH will change if each of the following chemicals is added to the solution. (a) HCl (b) NaHSO4 (c) CH3COONa (d) KBr (e) H2Oarrow_forwardClassify each of the following compounds as a strong electrolyte or a weak electrolyte. a. H3PO4 b. HNO3 c. KNO3 d. NaOHarrow_forward
- The pH of Mixtures of Acid, Base, and Salt Solutions a When 0.10 mol of the ionic solid NaX, where X is an unknown anion, is dissolved in enough water to make 1.0 L of solution, the pH of the solution is 9.12. When 0.10 mol of the ionic solid ACl, where A is an unknown cation, is dissolved in enough water to make 1.0 L of solution, the pH of the solution is 7.00. What would be the pH of 1.0 L of solution that contained 0.10 mol of AX? Be sure to document how you arrived at your answer. b In the AX solution prepared above, is there any OH present? If so, compare the [OH] in the solution to the [H3O+]. c From the information presented in part a, calculate Kb for the X(aq) anion and Ka for the conjugate acid of X(aq). d To 1.0 L of solution that contains 0.10 mol of AX, you add 0.025 mol of HCl. How will the pH of this solution compare to that of the solution that contained only NaX? Use chemical reactions as part of your explanation; you do not need to solve for a numerical answer. e Another 1.0 L sample of solution is prepared by mixing 0.10 mol of AX and 0.10 mol of HCl. The pH of the resulting solution is found to be 3.12. Explain why the pH of this solution is 3.12. f Finally, consider a different 1.0-L sample of solution that contains 0.10 mol of AX and 0.1 mol of NaOH. The pH of this solution is found to be 13.00. Explain why the pH of this solution is 13.00. g Some students mistakenly think that a solution that contains 0.10 mol of AX and 0.10 mol of HCl should have a pH of 1.00. Can you come up with a reason why students have this misconception? Write an approach that you would use to help these students understand what they are doing wrong.arrow_forwardHA is a weak acid. B1 and B2 are weak bases. Two acid/base neutralization experiments are performed and the pH values of the resulting solutions are reported below. Experiment 1. 0.45 mol weak acid HA and 0.45 mol weak base B1 are mixed into 1-L solution. The pH of the resulting solution is 5.87. Experiment 2. 0.45 mol weak acid HA and 0.45 mol weak base B2 are mixed into 1-L solution. The pH of the resulting solution is 9.24. Which of the following is correct about HA, B1 and B2? Choose one option only Options: a. Kb(B1) < Kb (B2) b. Kb(B1) > Kb (B2) c. Ka(HA) > Kb(B2) d. None of the abovearrow_forwardHA is a weak acid. B1 and B2 are weak bases. Two acid/base neutralization experiments are performed and the pH values of the resulting solutions are reported below. Experiment 1. 0.45 mol weak acid HA and 0.45 mol weak base B1 are mixed into 1-L solution. The pH of the resulting solution is 5.87. Experiment 2. 0.45 mol weak acid HA and 0.45 mol weak base B2 are mixed into 1-L solution. The pH of the resulting solution is 9.24. Which of the following is correct about HA, B1 and B2? a. Kb(B1) Kb (B2) с. Ка(НА) > КЫ(В2) o d. None of the abovearrow_forward
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