General Chemistry: Principles and Modern Applications (11th Edition)
11th Edition
ISBN: 9780132931281
Author: Ralph H. Petrucci, F. Geoffrey Herring, Jeffry D. Madura, Carey Bissonnette
Publisher: PEARSON
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Chapter 16, Problem 92IAE
Interpretation Introduction
Interpretation:
The reason for the large difference in pKa1 and pKa2 value of oxalic acid than suberic acid needs to be explained.
Concept introduction:
In the water, the product of concentration of OH- and H+ ions at a specific temperature is recognized as ionic product i.e. Kw of water. The Kw values increment with the increment in temperature which means the OH- and H+ ion’s concentration increments with the increment in temperature. The Kw value is
Here,
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Which of the following two acids has the stronger conjugate base?
Nitrous acid, Ka = 7.1 x 10–4 Phenol, Ka = 1.0 x 10–10
The strength of the conjugate base cannot be obtained from the information given.
Nitrous acid, because it has a larger Ka value.
Nitrous acid, because it has a smaller Ka value.
Phenol, because it has a larger Ka value.
Phenol, because it has a smaller Ka value.
Another way to express acid strength is by using pk b:pK a =−logK a Another way to express base strength is by using pK b pK b =−logK b A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's K a value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries.To find the pK a of X-281, you prepare a 0.079 M M test solution of X-281 at 25.0 ∘ C The pH of the solution is determined to be 3.00. What is the pK a of X-281?
Benozic acid (C6H5COOH) has a pKa of 4.20. What is the ratio of the acid to its conjugate acid at a pH of 2.20 and what is the formula of the conjugate acid?
Chapter 16 Solutions
General Chemistry: Principles and Modern Applications (11th Edition)
Ch. 16 - According to the Brønsted-Lowry theory, lebel each...Ch. 16 - Write the formula of the conjugate based in the...Ch. 16 - For each of the following, identify the acides and...Ch. 16 - Which of the following species are amphiprotic in...Ch. 16 - Why which of the following bases will the...Ch. 16 - In a manner similar to equation (16.3), represent...Ch. 16 - With the aid of Table 16.2, predict the direction...Ch. 16 - With the aid of Table 16.2, predict the direction...Ch. 16 - Calculate [H2O4] and [OH-] or each solution: (a)...Ch. 16 - What is the pH of each of the following solution?...
Ch. 16 - Calculate [H2O4] and pH in saturated Ba(OH)2(aq) ,...Ch. 16 - A saturated aqueous soon of Ca(OH)2, has a pH of...Ch. 16 - Prob. 13ECh. 16 - What is the PH of the solution obtained when 125mL...Ch. 16 - How many millilaters at concentrated HCI(aq) (360%...Ch. 16 - How many milliliters of a 15.0%, by mass solution...Ch. 16 - What volume of 6.15 N HCI(aq) is required to...Ch. 16 - A 282 L volume of HCl(g), measured at 742 mmHg and...Ch. 16 - 50.00 mL of 0.0155 M Hl(aq) is mixed with 75.00 mL...Ch. 16 - 2500 mL of a HNO2(aq) solution with a pH of 2.12...Ch. 16 - What are the [H2O4] and pH of 0.143 M HNO2 ?Ch. 16 - What are the [H2O4] and pH of 0.085 M C2H2NH2 ?Ch. 16 - For the ionization of phenylacetic acid,...Ch. 16 - A 625 mL sample an aqueous solution containing...Ch. 16 - Fluroaceticectic acid occurs in gifblaar, one of...Ch. 16 - Caproic acid, HCgH11O2 , found in small amounts in...Ch. 16 - What mass of benzoic acid, CgC5COOH , would you...Ch. 16 - Whet must be the molarity of en aqueous solution...Ch. 16 - What are [H2O4] , [OH-] , pH, and pOH of 0.55 M M...Ch. 16 - What are [H2O4],[CH+],NH, and NH of 0.300 M CH2NH2...Ch. 16 - The solubility of 1-naphthylamin, C10H1NH2 ,a...Ch. 16 - A saturated aqueous solution of o-nitropenol,...Ch. 16 - A particular vinegar e found to contain 57% acetic...Ch. 16 - A particular household ammoni a solution (d = 0.97...Ch. 16 - A 275 mL sample of vapor in equilibrium with...Ch. 16 - One handbook lists a value of 95 for pK, of...Ch. 16 - In the diagram below, the sketch on the far on the...Ch. 16 - In the diagram below, the sketch on the far left...Ch. 16 - What is the (a) degree of ionization and (b)...Ch. 16 - What is the (a) degree of ionization and (b)...Ch. 16 - What must be the molarity of an aqueous solution...Ch. 16 - What must be the molarity of an acetic acid...Ch. 16 - Continuing the dilution described in Example 16.4,...Ch. 16 - What is the (a) degree of ionization and (b)...Ch. 16 - Prob. 45ECh. 16 - Cola drinks have a phosphoric acid content that as...Ch. 16 - Determine [H2O+],[HS-] , and [S2-] for the...Ch. 16 - For 0.045 M MH2CO2 , a weak diprotic acid....Ch. 16 - Calculate [H2O4] , [HSO4] , and SO42- in (a) 0.75M...Ch. 16 - Adipic acid, HOOC( CH2)4COOH , is among the top 50...Ch. 16 - The antimalarial dru g quinine, C20H24O2N2 , is a...Ch. 16 - For hydrazine, N2H4,pKa1=6.07 end pK32=15.05 ....Ch. 16 - Codeine, C12H21O2N , is an opiate and...Ch. 16 - Approximately 4 metric tons of quinoline, C8H7N ,...Ch. 16 - Complete the following equations in those...Ch. 16 - From data in Table 16.4, determine (a) Kgfor...Ch. 16 - Predict whether a solution of each of the...Ch. 16 - Arrange the following 0.010M solutions in order of...Ch. 16 - What is the pH of an aqueous solution that is...Ch. 16 - What is the pH of an aqueous solution that is...Ch. 16 - Sorbic acid, CH2CH=CH=CH2CO2H(pKg=4.772) , is...Ch. 16 - Pyridine, C3H2N(pKb=8.82) , from a salt,...Ch. 16 - For each of the blowing ions, write two equations—...Ch. 16 - Suppose you wanted to produce an aqueous solution...Ch. 16 - Predict which is the stronger acid: (a) HClO2 or...Ch. 16 - Explain why trichloroacetic acid, CCl2COOH , is a...Ch. 16 - Which is the stronger acid of each of the...Ch. 16 - Indicate Which of the following the weakest ac,...Ch. 16 - From the following bases, select the one with the...Ch. 16 - For the molecular models shown, write the formula...Ch. 16 - For each reaction draw a Lewis structure for each...Ch. 16 - In the following reactions indicate which is the...Ch. 16 - Indicate whether each of the following is a Lewis...Ch. 16 - Each of the following is a Lewis acid-base...Ch. 16 - The three following reactions are acid-base...Ch. 16 - CO2(g) can be removed from confined quarters (such...Ch. 16 - The molecular solid l2(s) e only slightly in...Ch. 16 - The following very strong acids are formed by the...Ch. 16 - Use Lewis structures to diagram the following...Ch. 16 - Use Lewis structures to diagram the following...Ch. 16 - Prob. 81IAECh. 16 - Prob. 82IAECh. 16 - Prob. 83IAECh. 16 - Prob. 84IAECh. 16 - Prob. 85IAECh. 16 - Prob. 86IAECh. 16 - From the observation that 0.0500M vinylacetic acid...Ch. 16 - Prob. 88IAECh. 16 - Use material balance and an electroneutrality...Ch. 16 - Prob. 90IAECh. 16 - Prob. 91IAECh. 16 - Prob. 92IAECh. 16 - Prob. 93IAECh. 16 - What mass of acetic acad, CH2COOH , must be...Ch. 16 - Prob. 95IAECh. 16 - Prob. 96IAECh. 16 - Prob. 97IAECh. 16 - Prob. 98IAECh. 16 - Prob. 99IAECh. 16 - Prob. 100IAECh. 16 - In this problem, we will use material balance and...Ch. 16 - Prob. 102IAECh. 16 - Prob. 103IAECh. 16 - Prob. 104IAECh. 16 - Maleic acid is a carbon-hydrogen-oxygen compound...Ch. 16 - In Example 16-9, rather than use the quadratic...Ch. 16 - Apply the general method for solution equilibrium...Ch. 16 - Prob. 108SAECh. 16 - Prob. 109SAECh. 16 - Explain the important distinctions between each...Ch. 16 - Prob. 111SAECh. 16 - Prob. 112SAECh. 16 - Prob. 113SAECh. 16 - Prob. 114SAECh. 16 - Prob. 115SAECh. 16 - Prob. 116SAECh. 16 - Prob. 117SAECh. 16 - Prob. 118SAECh. 16 - Determine the pH of 2.05 M NaCH2 ClCOO. (Use data...Ch. 16 - Prob. 120SAECh. 16 - A solution is found to have pH=5pOH . Is this...Ch. 16 - Propionic acid, CH2CHCOOH , is 0.42% ionized in...Ch. 16 - The conjugate acid of HPO42- is (a) PO42 ; (b)...Ch. 16 - Prob. 124SAECh. 16 - Prob. 125SAECh. 16 - Appendix E describes a useful study aid known as...
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- Calculate the percentages of dissociated and undissociated forms present in the following solutions: (a) 0.0010 M glycolic acid (HOCH2CO2H; pKa = 3.83) at pH = 4.50 (b) 0.0020 M propanoic acid (pKa = 4.87) at pH = 5.30arrow_forwardCalculate the pKa value for each of the following acids. a. Phosphoric acid (H3PO4), Ka = 7.5 103 b. Hydrofluoric acid (HF), Ka = 6.8 104 c. Hydrogen phosphate ion (HPO42), Ka = 4.2 1013 d. Propanoic acid (HC3H5O2), Ka = 1.3 105arrow_forward16-27 Guanidine, p/Ca 13.6, is a very strong base, almost as basic as hydroxide ion. NH NH2+ II II H2N—C—NH2 + H2O H2N—C—NH2 + OH" Guanidine Guanidinium ion pKb = 13.6 Complete the Lewis structure for guanidine, showing all valence electrons. The remarkable basicity of guanidine is attributed to the fact that the positive charge on the guanidinium ion is delocalized by resonance over the three nitrogen atoms. This delocalization increases the stability of the guanidinium ion relative to the ammonium ion or substituted ammonium ions. Draw three equivalent contributing structures for the guanidinium ion and show by the use of curved arrows how these three contributors are related. Propose an explanation for the fact that protonation occurs on the C=NH nitrogen rather than on one of the —NH., nitrogens. (Hint: Consider the resonance stabilization of the structure formed by protonation on a —NH., nitrogen compared with the resonance stabilization of the structure formed by protonation on the =NH nitrogen.) Predict the N—C—N bond angles in the hybrid. Which is the stronger acid, the ammonium ion or the guanidinium ion?arrow_forward
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- Acid-Base Equilibria Many factors contribute to the acidity of organic compounds. Electronegativity, resonance, induction, hybridization, aromaticity, and atomic size, all play a role. In the following comparisons, you are asked to identify the factor(s) that would be most important to analyze when predicting relative acidity, and then to predict the trend in acidity and pKa values. For each of the following pairs of compounds answer the following two multiple-choice questions. 1. What factor(s) are the most important to consider when predicting the relative acidity of the two compounds? a. Electronegativity of the atom possessing the hydrogen. b. Resonance stabilization of the anionic conjugate base. c. Inductive stabilization of the anionic conjugate base. d. Hybridization of the atom possessing the hydrogen. e. The atomic size of the atom possessing the hydrogen.arrow_forwardConsider these acids (a) Arrange the acids in order of increasing acid strength from weakest to strongest. (b) Which acid has the smallest pKa value?arrow_forwardAt what pH is 50% of a compound, with a pKa = 7.3, in its basic form?arrow_forward
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