TestBankChapter17 - General Chemistry, 9e (Petrucci)...

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Unformatted text preview: General Chemistry, 9e (Petrucci) Chapter 17 Additional Aspects of Acid-Base Equilibria 1) The common ion in a mixture of a weak base and a strong base is the hydronium ion. Answer: True F Diff: 2 Refere nce: Sectio n 17 T Answer: True F Diff: 2 Reference: Section 17 1 T h e p H o f a b u f f er soluti on chang es slightl y with additi on of a small amou nt of acid or base. Answer: True F Diff: 2 Reference: Section 17 2 A s t r o n g a c id and its conju gate base will form a buffer . Answer: True F Diff: 2 Refere nce: Sectio n 17 T Answer: True F Diff: 2 Reference: Section 17.2 T h e c o l o r c hange range of most acid-base indica tors is 1 pH unit. Answer: True F Diff: 1 Refere nce: Sectio n 17 A Answer: True F Diff: 1 Reference: Section 17 3 I n t h e t i t r a t i o n o f a soluti on of HCN( aq) with NaO H(aq) , the equiv alence point occur s at a pH greate r than 7. Answer: True F Diff: 1 Reference: Section 17.4 F o r a n a c c u r a te titrati on, the end point needs to match the equiv alence point. Answer: True F Diff: 1 Reference: Section 17 4 A weak acid-strong base will produce a longer vertical section of a titration curve than will a strong acid-strong base. A n s w e r: True F Diff: 1 Refere nce: Sectio n 17 A Answer: True F Diff: 1 Reference: Section 17 5 A s a l t o f a polyp rotic acid such as NaHC O 3 canno t acid as an acid. Answer: True F Diff: 1 Refere nce: Sectio n 17 H It will lower the pH. B) The pH will not change. C) The solution becomes hotter. D) The pH cannot be measured. E) It will raise the pH. Answer: E Diff: 1 Reference: Section 17-1 14) How will addition of sodium chloride affect the pH of a HCl solution? A) It will lower the pH. B) The pH will not change. C) The solution becomes hotter. D) The pH cannot be measured. E) It will raise the pH. Answer: B Diff: 1 Reference: Section 17-1 15) What is the [H 3 O + ] of a solution measured to be 0.20 M in sodium acetate and 0.40 M in acetic acid? [ K a = 1.8 × 10-5 ] A) 1.8 × 10-5 B) 9.0 × 10-6 C) 3.6 × 10-5 D) 7.2 × 10-5 E) 4.7 Answer: C Diff: 1 Reference: Section 17-1 16) What is the concentration of the acetate ion of a solution measured to be 0.20 M acetic acid and 0.20 M in hydrochloric acid? [ K a for acetic acid = 1.8 × 10-5 ] A) 3.6 × 10-5 B) 9.0 × 10-6 C) 1.8 × 10-5 D) 7.2 × 10-5 E) 0.20 Answer: C Diff: 1 Reference: Section 17-1 17) Ten ...
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