Please name the structure, thanks Vanillylmandelic acid (pK, 3.42) is a metabolite found in urine, the pH of which is normally in the range from 4.8 to 8.4. Provide thestructure of vanillylmandelic acid that you would expect to find in urine with pH 5.8?онOHНОVanillylmandelic acid

IUPAC naming of vanilylmandelic acid.

Answered: Please name the structure, thanks

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter15: Complex Acid/base Systems

Section: Chapter Questions

Problem 15.16QAP

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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.
Find the value of Kb for the conjugate base of the following organic acids. (a) picric acid used in the manufacture of explosives; Ka = 0.16 (b) trichloroacetic acid used in the treatment of warts; Ka = 0.20
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?
Benzoic acid (C6H5COOH) and aniline (C6H5NH2) areboth derivatives of benzene. Benzoic acid is an acid withKa = 6.3 x10-5 and aniline is a base with Ka = 4.3 x10-10. (a) What are the conjugate base of benzoic acid andthe conjugate acid of aniline? (b) Anilinium chloride(C6H5NH3Cl) is a strong electrolyte that dissociates intoanilinium ions (C6H5NH3+) and chloride ions. Which willbe more acidic, a 0.10 M solution of benzoic acid or a 0.10M solution of anilinium chloride? (c) What is the value ofthe equilibrium constant for the following equilibrium?C6H5COOH(aq) + C6H5NH2(aq) ⇌ C6H5COO-(aq) + C6H5NH3+(aq)
Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine pKb1 = 5.1 and pKb2 = 9.7 (pKb = −log(Kb)). Only 1.0 g of quinine will dissolve in 1900.0 mL of water. Calculate the pH of saturated aqueous solution of quinine. Consider only the reaction Q + H2O QH+ + OH− described by pKb1, where Q = quinine.
Addition of phenolphthalein to an unknown colorlesssolution does not cause a color change. The addition ofbromthymol blue to the same solution leads to a yellowcolor. (a) Is the solution acidic, neutral, or basic? (b) Whichof the following can you establish about the solution: (i) Aminimum pH, (ii) A maximum pH, or (iii) A specific rangeof pH values? (c) What other indicator or indicators wouldyou want to use to determine the pH of the solution moreprecisely?
1) Complete the following reactions and identify the acid, base, conjugate acid and conjugate base. CH;CH,NH2 (aq) + H2O (1) a) CH;COOH (aq) + H,O (I) b) c) Identify the conjugate base and conjugate acid of each of the following. Conjugate Base Molecule Conjugate Acid HCO3 H20 HSO4- H2PO4
Consider two acids: HCO2H (formic acid, pKa = 3.8) and pivalic acid [(CH3)3CCO,H, pK = 5.0]. (a) Which acid has the larger K? (b) Which acid is the stronger acid? (c) Which acid forms the stronger conjugate base? (d) When each acid is dissolved in water, for which acid does the equilibrium lie further to the right? %3D The pKa values in Table 2.1 span a large range (-7 to 50). The pK, scale is logarithmic. small difference in pK, translates into a large numerical difference, For example, the diffe between the pK, of NH3 (38) and CH2=CH, (44) is six pKa units. This means that NH, is one million times more acidic than CH,=CH,.
The pKa value of CH3COOH/CH3COO- is 4.75. At what pH value are the concentration of CH3COO- and CH3COOH the same?
Consider two acids: HCO2H (formic acid, pKa = 3.8) and pivalic acid [(CH3)3CCO2H, pKa = 5.0]. (a) Which acid has the larger Ka? (b) Which acid is the stronger acid? (c) Which acid forms the stronger conjugate base? (d) When each acid is dissolved in water, for which acid does the equilibrium lie further to the right?
Quinine (C20 H24 N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine, pKb, = 5.1 and pK, = 9.7 (pK, = - log Kp). Only 1 g quinine will dissolve in 1930.0 mL of solution. Calculate the pH of a saturated aqueous solution of quinine. Consider only the reaction Q+ H20 = QH+ + OH° described by pK,, where Q = quinine. pH =
An analytical chemist is titrating 106.0 mL of a 0.1800M solution of piperidine (C5H₁NH) with a 0.7800M solution of HIO3. The pK, of piperidine is 2.89. Calculate the pH of the base solution after the chemist has added 15.4 mL of the HIO3 solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of HIO3 solution added. Round your answer to 2 decimal places. pH = X B Ar

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