INTO TO CHEMISTRY (EBOOK ACCESS CODE)
5th Edition
ISBN: 9781307892864
Author: BAUER
Publisher: MCG
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Chapter 13, Problem 101QP
Interpretation Introduction
Interpretation:
The change on titrating an acid of
Concept Introduction:
Indicators are brightly coloured organic dyes and are weak acids and bases. They give different colours in different
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Chapter 13 Solutions
INTO TO CHEMISTRY (EBOOK ACCESS CODE)
Ch. 13 - How do acids and bases differ from other...Ch. 13 - Prob. 2QCCh. 13 - Prob. 3QCCh. 13 - Prob. 4QCCh. 13 - Prob. 5QCCh. 13 - Prob. 6QCCh. 13 - Prob. 1PPCh. 13 - Prob. 2PPCh. 13 - Prob. 3PPCh. 13 - Prob. 4PP
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- For conjugate acidbase pairs, how are Ka and Kb related? Consider the reaction of acetic acid in water CH3CO2H(aq)+H2O(l)CH3CO2(aq)+H3O+(aq) where Ka = 1.8 105 a. Which two bases are competing for the proton? b. Which is the stronger base? c. In light of your answer to part b. why do we classify the acetate ion (CH3CO2) as a weak base? Use an appropriate reaction to justify your answer. In general, as base strength increases, conjugate acid strength decreases. Explain why the conjugate acid of the weak base NH3 is a weak acid. To summarize, the conjugate base of a weak acid is a weak base and the conjugate acid of a weak base is a weak acid (weak gives you weak). Assuming Ka for a monoprotic strong acid is 1 106, calculate Kb for the conjugate base of this strong acid. Why do conjugate bases of strong acids have no basic properties in water? List the conjugate bases of the six common strong acids. To tie it all together, some instructors have students think of Li+, K+, Rb+, Cs+, Ca2+, Sr2+, and Ba2+ as the conjugate acids of the strong bases LiOH, KOH. RbOH, CsOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2. Although not technically correct, the conjugate acid strength of these cations is similar to the conjugate base strength of the strong acids. That is, these cations have no acidic properties in water; similarly, the conjugate bases of strong acids have no basic properties (strong gives you worthless). Fill in the blanks with the correct response. The conjugate base of a weak acid is a_____base. The conjugate acid of a weak base is a_____acid. The conjugate base of a strong acid is a_____base. The conjugate acid of a strong base is a_____ acid. (Hint: Weak gives you weak and strong gives you worthless.)arrow_forwardWhich of the acid-base indicators discussed in this chapter would be suitable for the titration of (a) HNO3 with KOH. (b) KOH with acetic acid. (c) HCl with NH3. (d) KOH with HNO2. Explain your answers.arrow_forward8-58 What is the connection between buffer action and Le Chatelier's principle?arrow_forward
- Suppose 85 mL of a buffer solution that was 0.15 M HCHO2 and 0.25 M NaCHO₂ had 7.5 mL of 0.10 M hydrochloric acid added to it. Afterwards, 35 mL of this mixture was measured out, placed inside an Erlenmeyer flask, and diluted to 75 mL. What was the concentration of the hydroxide ion in the resulting solution in the flask? Ka for HCHO2, formic acid, is 1.7 x 10-4. a. 9.80 x 10-11 M Ob. 2.81 x 10-7 M c. 2.55 x 10-9 M d. 8.94 x 10-11 M e. 2.10 x 10-10 M 9.77 x 10-11 M g. 1.12 x 10-4 M Incorrect Of. Oh. 1.91 x 10-10 Marrow_forwardWrite an introduction for the titration of acetic acid with NaOH and for the titration of Polyprotic acids with NaOH.arrow_forwardPetanoic (or valeric) acid is a weak organic acid with an unpleasant odour. Like other small carboxylic acids, it is used to make pleasant smelling esters that are used in perfumes, cosmetics, and food additives. Completed Part D In Part B, a 20.00 mL aliquot of a 0.195 mol L-1 pentanoic acid solution was titrated to its equivalence point with 19.7 mL of 0.198 mol L- 1 NaOH solution. At the equivalence point, all of the weak acid, pentanoic acid, is converted to its weak conjugate base, pentanoate. In part A, the Ka for pentanoic acid was determined to be 1.48×10-5. What is the pH at this equivalence point? 5.089 6.997 pentanoic acid 9.170 4.830 The pka of pentanoic acid is 4.830. 8.911arrow_forward
- 2) The next 9 questions are related to the titration of 20.00 mL of a 0.0750 M acetic acid solution with 0.0700 M KOH. What volume of KOH is required to reach the equivalence point of the titration (in mL)?arrow_forwardSuppose you are given solutions of 1.00 M acetic acid and 1.00 M sodium acetate and are asked to make 100.00 mL of buffer at pH 5.00 using only these two solutions. What volume, in milliliters, of acid would you need? The pKa of acetic acid is 4.75.arrow_forwardCalculate the pH of a mixture of 0.12 M acetic acid and 0.25 M sodium acetate. The pKa of acetic acid is 4.76.arrow_forward
- In Part A, a 15.00 mL aliquot of a 0.155 mol L-1 3-methylbutanoic acid solution was titrated to its equivalence point with 11.7 mL of 0.198 molL-1 NaOH solution. At the equivalence point, all of the weak acid, 3-methylbutanoic acid, is converted to its weak conjugate base, 3-methylbutanoate. What is the pH at this equivalence point? 6.957 4.770 8.855 5.145 O 9.230arrow_forwardHow do I determine the concentration of hydrochloric acid through acid-base titration? I mean what experiment could be done to do it. Like what materials or methods to usearrow_forwardWhat is the purpose of titration? What is the purpose of phenolphthalein? Why is phenolphthalein traditionally used in titrations?arrow_forward
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