Chemistry In Focus
6th Edition
ISBN: 9781305084476
Author: Tro, Nivaldo J., Neu, Don.
Publisher: Cengage Learning
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Chapter 15, Problem 47E
The salt bridges that hold hair protein (keratin) strands together rely on
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Part A:
Write an equation that represents the action in water of hydrosulfuric acid (H2S) as a Brønsted–Lowry acid.
Part B:
Write an equation that represents the action in water of aziridine (C2H5N) as a Brønsted–Lowry base.
Write a balanced equation showing how the HPO24 - ion of sodium hydrogen phosphate Na2HPO4 can be a both conjugated acid and conjugated base.
The [–OH] in a sample of egg whites is 6.3 × 10–7 M. What is the [H3O+] in these eggwhites?
Chapter 15 Solutions
Chemistry In Focus
Ch. 15 - Prob. 15.1YTCh. 15 - Prob. 1SCCh. 15 - Prob. 2SCCh. 15 - Prob. 3SCCh. 15 - Prob. 1ECh. 15 - Prob. 2ECh. 15 - Prob. 3ECh. 15 - Prob. 4ECh. 15 - Prob. 5ECh. 15 - Prob. 6E
Ch. 15 - Prob. 7ECh. 15 - Prob. 8ECh. 15 - Prob. 9ECh. 15 - Prob. 10ECh. 15 - Prob. 11ECh. 15 - Prob. 12ECh. 15 - Prob. 13ECh. 15 - Define eutrophication.Ch. 15 - Prob. 15ECh. 15 - Prob. 16ECh. 15 - Prob. 17ECh. 15 - Prob. 18ECh. 15 - Prob. 19ECh. 15 - What are the three types of interactions that...Ch. 15 - Prob. 21ECh. 15 - Prob. 22ECh. 15 - Prob. 23ECh. 15 - Prob. 24ECh. 15 - Prob. 25ECh. 15 - Prob. 26ECh. 15 - Prob. 27ECh. 15 - Prob. 28ECh. 15 - Prob. 29ECh. 15 - How do sunscreens protect your skin from the Suns...Ch. 15 - Prob. 31ECh. 15 - Prob. 32ECh. 15 - Prob. 33ECh. 15 - Prob. 34ECh. 15 - Prob. 35ECh. 15 - Prob. 36ECh. 15 - Prob. 37ECh. 15 - Prob. 38ECh. 15 - Prob. 39ECh. 15 - Prob. 40ECh. 15 - Prob. 41ECh. 15 - Prob. 42ECh. 15 - Prob. 43ECh. 15 - Prob. 44ECh. 15 - Prob. 45ECh. 15 - Prob. 46ECh. 15 - The salt bridges that hold hair protein (keratin)...Ch. 15 - Prob. 48ECh. 15 - The hydrochloric acid present in toilet bowl...Ch. 15 - Prob. 50ECh. 15 - Prob. 51ECh. 15 - Prob. 52ECh. 15 - Prob. 53ECh. 15 - Prob. 54ECh. 15 - Prob. 55ECh. 15 - Prob. 56ECh. 15 - Prob. 57ECh. 15 - Prob. 58ECh. 15 - Prob. 59ECh. 15 - Prob. 60ECh. 15 - Prob. 61ECh. 15 - Prob. 62ECh. 15 - Prob. 64ECh. 15 - Prob. 65E
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- Write a net ionic equation to show that piperidine, C5H11N, behaves as a Bronsted-Lowry base in water. BL base BL acid BL acid BL base + H2O +arrow_forwardTable: Name: Serine pka: 2.187 (CO2H) / 9.209 (NH3) Ka: 6.50*10^-3 (CO2H) / 6.18*10^-10 (NH3) What is the pH, along with the concentration of each form of serine, in a 0.020 0 M solution of serine hydrochloride? What is the pH, along with the concentration of each form of serine, in a 0.020 0 M solution of the sodium salt of serine? What is the pH, along with the concentration of each form of serine, in a 0.020 0 M solution of serine? Calculate the isoionic and isoelectric pH for 0.020 0 M serine.arrow_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
- All amino acids have at least two functional groups with acidic or basic properties. In alanine, the carboxylic acid group has Ka = 4.5 103 and the amino group has Kb = 7.4 105. Three ions of alanine are possible when alanine is dissolved in water. Which of these ions would predominate in a solution with [H+] = 1.0 M? In a solution with [OH] = 1.0 M?arrow_forward(a) Draw the Lewis structure for the amino acid phenylalanine, showing the amino group and the carboxylic group in their un-ionized forms. (b) Draw the Lewis structure for the zwitterionic form of phenylalanine. (c) Which of these structures will be the predominant form at physiological pH?arrow_forwardDraw the structure of glyceryl trilaurate, a fat. Laurie acid (page 941) has the formula C11H23CO2H. (a) Write an equation for the base hydrolysis of glyceryl trilaurate. (b) Write an equation for the reaction that could be used to prepare biodiesel fuel from this fat.arrow_forward
- 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_forward1. Write the net ionic equation for the acid-base hydrolysis equilibrium that is established when calcium cyanide is dissolved in water. 2. Write the net ionic equation for the acid-base hydrolysis equilibrium that is established when potassium hypochlorite is dissolved in water.arrow_forwardWhat is the hydronium-ion concentration of a 2.13 ✕ 10−4 M solution of p-bromobenzoic acid, BrC6H4COOH, for which Ka = 1.10 ✕ 10−4?arrow_forward
- When added to water, ethylamine undergoes the following reaction: C2H5NH2 + H2O C2H5NH3+ + OH- Is ethylamine an acid or a base in this reaction? Strong or weak? How do you know? 6. Name Ca(OH)2 and write its ionization equation.arrow_forwardWhat volume of a 250 µg/mL of a buffered solution of DNA is required to deliver 5.0 µg of DNA?arrow_forwardbeginning with arecoline (pKa:7.6), Show the acid dissociation equilibrium reaction for arecoline in water. Label conjugate base and weak acid in this reaction. Saliva has a pH of 6.8, Calculate the percentage of arecoline in the HA form in typical saliva. Betel nut is usually chewed with a small amount of slaked lime Ca(OH)2. Explain why slaked lime improves the bioavailability and thus the effects of arecoline.arrow_forward
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General Chemistry | Acids & Bases; Author: Ninja Nerd;https://www.youtube.com/watch?v=AOr_5tbgfQ0;License: Standard YouTube License, CC-BY