1) Consider the reaction AH + H₂O ≤ A:O + H3O¹. For the following named acids: 1) draw the structure of the acid, 2) give the approximate pKa value of the acid in multiples of 5, 3) give the name of the conjugate base, and 4) draw the structure of the conjugate base. m-Chlorophenol iso-Butyl ammonium ion pKa 3-Pentanone pka_ acid Conj. base acid Conj. base pKa Benzoic acid pKa Diethyl Malonate pka_ Benzyl oxonium ion pka_ 1-pentyne pKa Ethyl Acetate pka_

1) Consider the reaction AH + H₂O ≤ A:O + H3O¹. For the following named acids: 1) draw the structure of the acid, 2) give the approximate pKa value of the acid in multiples of 5, 3) give the name of the conjugate base, and 4) draw the structure of the conjugate base. m-Chlorophenol iso-Butyl ammonium ion pKa 3-Pentanone pka_ acid Conj. base acid Conj. base pKa Benzoic acid pKa Diethyl Malonate pka_ Benzyl oxonium ion pka_ 1-pentyne pKa Ethyl Acetate pka_

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter8: Polyfunctional Acids And Bases

Section: Chapter Questions

Problem 1P

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Dicarboxylic acids have two dissociation constants, one for the initial dissociation into a monoanion and one for the second dissociation into a dianion. For oxalic acid, HO2Câ€”CO2H, the first ionization constant is pKal = 1.2 and the second ionization constant is pKa2 = 4.2. Why is the second carboxyl group far less acidic than the first?
16-27 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?
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.
1a) Consider the reaction AH(+) + H₂O A: + H3O+). For the following named acids: a) draw the structure of the acid, b) give the approximate pKa of the conjugate acid in units of 5, c) give the name of the conjugate base, and d) draw the structure of the conjugate base. p-Toluenesulfonic acid acid Conjugate base Imidazolium cation pka_ pKa iso-Propanol pKa Acetylene pKa
Conjugate base acid 1a. Consider the reaction AH(+) + H₂O →> A:(-) + H3O+). For the following named acids: a) draw the structure of the acid, b) give the approximate pKa of the conjugate acid in units of 5, c) give the name of the conjugate base, and d) draw the structure of the conjugate base. Dimethyl sulfoxide pKa Acrylic Acid pKa Ethyl Acetate pKa Benzamide pKa
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The pKas of the conjugate acids of -OH (conjugate acid H2O) and HPO42- (conjugate acid H2PO4-) are 15.7 and 6.8, respectively. First, identify which is the strong base, and which is the weak base. Then, explain how you can use these pKa values to help you identify which compounds will be separated at each step.
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What is the pKa of benzoic acid? What is the molar concentration of sodium benzoate (conjugate base)? What is the molar concentration of benzoic acid (weak acid)?
If the concentration of an acid in solution is 2.2 times larger than the concentration of its conjugate base, and the pH of the solution is 3.5, what is the pKa of the acid? Include the answer to 3 significant figures
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