Chemistry: An Atoms-Focused Approach (Second Edition)
2nd Edition
ISBN: 9780393615197
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster, Stacey Lowery Bretz
Publisher: W. W. Norton & Company
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- if you add NaPh to a solution of carbonic acid so that final ph is 5.0, which will be higher the concentration of the acid or the concentration of the conjugate base?
45. HC2H3O2 (aq) + CN¯ (aq) <===> HCN (aq) + C2H3O2¯ (aq)
The reaction represented above has an equilibrium constant equal to 3.7 x 104. Which of the following can be concluded from this information?
A) CN¯ (aq) is a stronger base than C2H3O2¯ (aq)
B) HCN (aq) is a stronger acid than HC2H3O2 (aq)
C) The conjugate base of CN¯(aq) is C2H3O2¯ (aq)
D) The equilibrium constant will increase with an increase in temperature.
E) The pH of a solution containing equimolar amounts of CN¯(aq) and HC2H3O2 (aq) is 7.0.
Amino acids can act as both Brønsted–Lowry acids and bases. The structure of the amino acid leucine (NH2CH(CH 2 CH(CH3) 2)COOH) is shown below.
a) What part of the structure allows leucine to act as a Brønsted–Lowry base? How do you know?
b) What is the conjugate acid of leucine? Either write the formula or sketch its structure.
c) What is the conjugate base of leucine? Either write the formula or sketch its structure.
Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach (Second Edition)
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- Which of the following common food additives gives a basic solution when dissolved in water? (a) NaNO3 (used as a meat preservative) (b) NaC6H5CO2(Sodium benzoate, used as a soft drink preservative) (c) NaH2PO4(used as a emulsifier in the manufacture of pasteurized cheese)arrow_forwardIn a hospital laboratory the pH of a bile sample is measured as 7.90 at 25 °C. Calculate the H3O+ concentration. Is the sample acidic or basic?arrow_forwardA hydrogen atom in the organic base pyridine, C5H5N, can be substituted by various atoms or groups to give XC5H4N, where X is an atom such as Cl or a group such as CH3. The following table gives Ka values for the conjugate acids of a variety of substituted pyridines. (a) Suppose each conjugate acid is dissolved in sufficient water to give a 0.050 M solution. Which solution would have the highest pH? The lowest pH? (b) Which of the substituted pyridines is the strongest Brnsted base? Which is the weakest Brnsted base?arrow_forward
- The active ingredient formed by aspirin in the body is salicylic acid, C6H4OH(CO2H). The carboxyl group. (-CO2H) acts as a weak acid. The phenol group (an OH group bonded to an aromatic ring) also acts as an acid but a much weaker acid. List, in order of descending concentration, all of the ionic and molecular species present in a 0.001-M aqueous solution of C6H4OH(CO2H).arrow_forwardWhat causes acid indigestion? List some common antacid ingredients and their side effects.arrow_forwardNicotinic acid, C6H5NO2, is found in minute amounts in all living cells, hut appreciable amounts occur in liver, yeast, milk, adrenal glands, white meat, and corn. Whole wheat (lour contains about 60. 0g per gram of flour. One gram (1.00 g) of the acid dissolves in water to give 60. mL of solution having a pH of 2.70. What is the approximate value of Ka for the acid? Nicotinic acidarrow_forward
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