Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Textbook Question
Chapter 15, Problem 82E
The simplest amino acid is glycine, H2NCH2CO2H. The common feature of amino acids is that they contain the
(a) Write the Lewis structures of the ions that form when glycine is dissolved in 1 M HCl and in 1 M KOH.
(b) Write the Lewis structure of glycine when this amino acid is dissolved in water. (Hint: Consider the relative base strengths of the -NH2 and -CO2- groups.)
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The simplest amino acid is glycine, H2NCH2CO2H. The common feature of amino acids is that they contain the functional groups: an amine group, –NH2, and a carboxylic acid group, –CO2H. An amino acid can function aseither an acid or a base. For glycine, the acid strength of the carboxyl group is about the same as that of acetic acid, CH3CO2H, and the base strength of the amino group is slightly greater than that of ammonia, NH3.(a) Write the Lewis structures of the ions that form when glycine is dissolved in 1 M HCl and in 1 M KOH.(b) Write the Lewis structure of glycine when this amino acid is dissolved in water.
Three acids found in foods are lactic acid, LA, (in milk products), oxalic acid, OA, (in rhubarb), and malic
acid, MA (in apples). The pKa values are LA =3.88, OA =1.23, and MA =3.40.
Which list has the conjugate bases of these acids, lactate, oxalate, and malate, in order of decreasing
strength?
O lactate > malate > oxalate
lactate > oxalate > malate
malate > lactate > oxalate
oxalate > malate > lactate
An acid-base equilibrium system is created by dissolving 0.50 mol CH3CO2H in water to a volume of 1.0 L. What is the effect of adding 0.50 mol CH3CO2–(aq) to this solution?
1.The pH of the solution will equal 7.00 because equal concentrations of a weak acid and its conjugate base are present.
2.Some CH3CO2H(aq) will ionize, increasing the concentration of CH3CO2–(aq) and increasing the pH.3.Some CH3CO2–(aq) will react with H3O+, increasing the concentration of CH3CO2H(aq) and reestablishing the solution equilibrium.
b. 2 only c. 3 only d. 1 and 3 e. 1, 2, and 3
Chapter 15 Solutions
Chemistry by OpenStax (2015-05-04)
Ch. 15 - Complete the changes in concentrations for each of...Ch. 15 - Complete the changes in concentrations for each of...Ch. 15 - How do the concentrations of Ag+ and CrO42- in a...Ch. 15 - How do the concentrations of Pb2+ and S2- change...Ch. 15 - What additional information do we need to answer...Ch. 15 - Which of the following slightly soluble compounds...Ch. 15 - Which of the following slightly soluble compounds...Ch. 15 - Write the ionic equation for dissolution and the...Ch. 15 - Write the ionic equation for the dissolution and...Ch. 15 - The Handbook of Chemistry and Physics...
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(a) What mass...Ch. 15 - Calculate the volume of 1.50 M CH3CO2H required to...Ch. 15 - Even though Ca(OH)2 is an inexpensive base, its...Ch. 15 - What mass of NaCN must be added to 1 L of 0.010 M...Ch. 15 - Magnesium hydroxide and magnesium citrate function...Ch. 15 - The following question is taken from a Chemistry...Ch. 15 - Which of the following compounds, when dissolved...Ch. 15 - Which of the following compounds, when dissolved...Ch. 15 - What is the effect on the amount of solid Mg(OH)2...Ch. 15 - What is the effect on the amount of CaHPO4 that...Ch. 15 - Identify all chemical species present in an...Ch. 15 - A volume of 50 mL of 1.8 M NH3 is mixed with an...
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