EBK ORGANIC CHEMISTRY
8th Edition
ISBN: 8220102744127
Author: Bruice
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 13, Problem 70P
Phenolphthalein is an acid-base indicator. In solutions of pH < 8.5, it is colorless in solutions of pH > 8.5, it is deep red-purple. Account for the change in color.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
3. 40.00 mL of 0.0900 M NaOH is diluted to 100mL and titrated with 0.1000M HCI. Calculate the
pH after the addition of the following volumes of titrant (mL); (a) 0.00; (b) 10.00 ; (c) 18.00:
(d) 30.00 ; (e) 35.95 ; (f) 36.00 (g) 36.05 ; (h) 40.00.
The acid-base indicator "Thymol Blue" has two transition ranges as listed below (with
the corresponding acid dissociation constants):
7.
Ka
AcidColour
BaseColour
Thymol Blue 1
Thymol Blue 2
2.24 x 102
Red
Yellow
1.26 x 10
Yellow
Blue
What colour would you expect it to be at the following pH values? Briefly justify your
answers.
(a)
(b)
(c)
(d)
0.9
5.2
7.8
10.7
Which of the following would be the best choice of a buffering system at pH 6.0?
(a) H2SO4/HSO4-(b) Lactic Acid/Lactate(c) Carbonic Acid/Carbonate
(d) Ammonium/ammonia
Chapter 13 Solutions
EBK ORGANIC CHEMISTRY
Ch. 13.1 - Which of the following fragments produced in a...Ch. 13.2 - What distinguishes the mass spectrum of...Ch. 13.2 - What is the most likely m/z value for the base...Ch. 13.3 - Prob. 5PCh. 13.3 - a. Suggest possible molecular formulas for a...Ch. 13.3 - If a compound has a molecular ion with an...Ch. 13.3 - Identify the hydrocarbon that has a molecular ion...Ch. 13.4 - Predict the relative intensities of the molecular...Ch. 13.5 - Which molecular formula has an exact molecular...Ch. 13.5 - Prob. 11P
Ch. 13.6 - Sketch the mass spectrum expected for...Ch. 13.6 - The mass spectra of 1-methoxybutane,...Ch. 13.6 - Primary alcohols have a strong peak at m/z = 31....Ch. 13.6 - Identify the ketones responsible for the mass...Ch. 13.6 - Prob. 16PCh. 13.6 - Using curved arrows, show the principal fragments...Ch. 13.6 - The reaction of (Z)-2-pentene with water and a...Ch. 13.9 - a. Which is higher in energy: electromagnetic...Ch. 13.9 - Prob. 20PCh. 13.13 - Prob. 21PCh. 13.14 - Which occur at a larger wavenumber: a. the C O...Ch. 13.14 - Prob. 23PCh. 13.14 - Prob. 24PCh. 13.14 - Rank the following compounds from highest...Ch. 13.14 - Which shows an O H stretch at a larger...Ch. 13.16 - Prob. 27PCh. 13.16 - a. An oxygen-containing compound shows an...Ch. 13.16 - Prob. 29PCh. 13.16 - For each of the following pair of compounds, name...Ch. 13.17 - Which of the following compounds has a vibration...Ch. 13.17 - Prob. 32PCh. 13.18 - A compound with molecular formula C4H6O gives the...Ch. 13.20 - Prob. 34PCh. 13.20 - Prob. 35PCh. 13.21 - Predict the max of the following compound:Ch. 13.21 - Prob. 37PCh. 13.23 - a. At pH = 7 one of the ions shown here is purple...Ch. 13.23 - Prob. 39PCh. 13.23 - Prob. 40PCh. 13 - In the mass spectrum of the following compounds,...Ch. 13 - Prob. 42PCh. 13 - Draw structures for a saturated hydrocarbon that...Ch. 13 - Rank the following compounds in order of...Ch. 13 - For each of the following pairs of compounds,...Ch. 13 - a. How could you use IR spectroscopy to determine...Ch. 13 - Assuming that the force constant is approximately...Ch. 13 - Norlutin and Enovid are ketones that suppress so...Ch. 13 - In the following boxes, list the types of bonds...Ch. 13 - A mass spectrum shows significant peaks at m/z. =...Ch. 13 - Prob. 51PCh. 13 - Prob. 52PCh. 13 - Prob. 53PCh. 13 - The IR spectrum of a compound with molecular...Ch. 13 - Rank the following compounds from highest...Ch. 13 - Rank the following compounds from highest...Ch. 13 - What peaks in their mass spectra can be used to...Ch. 13 - Prob. 58PCh. 13 - Which one of the following five compounds produced...Ch. 13 - Prob. 60PCh. 13 - Each of the IR spectra shown below is accompanied...Ch. 13 - Prob. 62PCh. 13 - Prob. 63PCh. 13 - How can IR spectroscopy distinguish between...Ch. 13 - Prob. 65PCh. 13 - Prob. 66PCh. 13 - Give approximate wavenumbers for the major...Ch. 13 - Prob. 68PCh. 13 - Which one of the following live compounds produced...Ch. 13 - Phenolphthalein is an acid-base indicator. In...Ch. 13 - Prob. 71PCh. 13 - How can you use UV spectroscopy to distinguish...Ch. 13 - Prob. 73PCh. 13 - The IR and mass spectra for three different...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- 32. A solution of ammonia, NH3, has pH = 11.50. What is the ammonia concentration? (The pKa of NH is 9.24.) %3D (A) 1.7 x 10-5 M (В) 3.2 x 103 М (C) 5.5 x 10-3 M (D) 0.58 M 33. At equilibrium, a solution contains 0.50 mol each of Cd2" (aq), SCN (aq), and Cd(SCN) (aq). What is the solution's volume? Cd2"(aq) + 4 SCN(aq) Cd(SCN),²-(aq) ·5OK D1.0 x 103 5ల .50 !!arrow_forwardPayalarrow_forwardThe acid dissociation constants for sulfurous acid are: Ka = 1.2 x 10-2 and Kaz = 6.6 x 10-8. (i) Calculate the pH of a solution of 0.100 M H2SO3. (ii) Calculate the pH of a solution of 0.100M NazSO.. (iii) Calculate the pH of a solution resulting when equal volumes of the solutions described in parts (i) and (ii) are mixed.arrow_forward
- A sufficient quantity of each of the following aqueous solutions has been made available to you: (i) 0.2M NaH2PO4; (ii) 0.1M Na2HPO4 (a) How many ml of each of these two solutions would you require to mix together in order to prepare one litre of a 0.01M phosphate buffer pH 7.2? [For H3PO4: pKa1 = 2.15; pKa2 = 6.82; pKa3 = 12.38]. (Ans. = 14.7 ml 0.2M NaH2PO4; and 70.6 ml Na2HPO4). (b) Having calculated these volumes (of 0.2 M NaH2PO4 and 0.1M Na2HPO4) required, what further steps would you take to prepare the 0.01M phosphate buffer solution of pH 7.2?arrow_forwardAddition of the indicator methyl orange to an unknownsolution leads to a yellow color. The addition of bromthymolblue to the same solution also leads to a yellow color.(a) Is the solution acidic, neutral, or basic? (b) What is therange (in whole numbers) of possible pH values for the solution?(c) Is there another indicator you could use to narrowthe range of possible pH values for the solution?arrow_forward3) 4 7 8. 9. 10 11 12 13 A solution is prepared at 25 °C that is initially 0.44M in diethylamine ((C,H,),NH, a weak base with K,=1.3 × 10 °, and 0.072M in diethylammonium chloride ((C,H5), NH,CI). Calculate the pH of the solution. Round your answer to 2 decimal places. pH = Submit Assignr Cornuearrow_forward
- 6arrow_forwardA 250-mL buffer solution contains 0.0510 mole of KH2PO4 and 0.0875 mole of K2HPO4. (a) Calculate the molar concentrations of H2PO4–and HPO42–, respectively, in thesolution. (b) What is the pH of the solution? (H2PO4– has Ka = 6.2 x 10–8) (c) Write a net ionic equation for the buffering reaction against a strong acid by this buffer. (d) If 0.012 mole of hydrochloric acid (HCl) is added to the solution, create a reaction table to show the buffering reaction and calculate the molar concentration of H2PO4–and HPO42–, respectively, in the resulting solution after the buffering reaction. (e) What is the pH of the resulting solution?arrow_forwardThe values of pK,(1) and pK (2) for chromic acid (H2CrO4) are 0.74 and 6.49 respectively. 7.1 (a) Determine values of K, for each dissociation step. (b) Write equations to represent the dissociation steps of chromic acid in aqueous solution.arrow_forward
- . (a) Which is the stronger base—the basic form of the indicator cresol red or the basic form of thymolphthalein?(b) A solution is prepared in which cresol red is red and thymolphthalein is colorless. Estimate the pH of this solution.arrow_forwardThe colour of Phenolphthalein indicator in basic medium is O colourless O Blood red Pink Redarrow_forwardPlease answer both asapparrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Principles of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning
Principles of Modern Chemistry
Chemistry
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:Cengage Learning
O-Level Chemistry | 16 | Qualitative Analysis [1/3]; Author: Bernard Ng;https://www.youtube.com/watch?v=oaU8dReeBgA;License: Standard YouTube License, CC-BY