Question 1 - b = 1.8 10-5 ) is titrated with 0.1 M H 2 SO 4...

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Question 1 0 of 2 points Consider the K a values for the following acids: Cyanic acid, HOCN, 3.5 × 10 -4 Formic acid, HCHO 2 , 1.7 × 10 -4 Lactic acid, HC 3 H 5 O 3 , 1.3 × 10 -4 Propionic acid, HC 3 H 5 O 2 , 1.3 × 10 -5 Benzoic acid, HC 7 H 5 O 2 , 6.3 × 10 -5 Which of the following is the strongest acid? Selected Answer: Benzoic acid Correct Answer: Cyanate ion Question 2 2 of 2 points Which of the following salt solutions is basic? Selected Answer: Na 2 CO 3 Correct Answer: Na 2 CO 3 Question 3 0 of 2 points The titration curve that BEST represents the titration of a strong base with a strong a is Selected Answer: Figure 4. Correct Answer: Figure 5. Question 4 2 of 2 points
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A weak base is titrated with hydrochloric acid solution. At the equivalence point, Selected Answer: pH < 7.0. Correct Answer: pH < 7.0. Question 5 0 of 4 points A 0.10 M aqueous solution of an acid HX has a pH of 3.00. What is the value of K a for HX? Selected Answer: 1.0 10 -6 Correct Answer: 1.0 10 -5 Question 6 2 of 2 points A sample of ammonia (K
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Unformatted text preview: b = 1.8 10-5 ) is titrated with 0.1 M H 2 SO 4 . At the equivalence point, the pH is approximately Selected Answer: 5. Correct Answer: 5. Question 7 0 of 2 points The relative strengths of the following acids increase in the order K a I. CH 3 COOH 1.8 x 10-5 II. HOCN 3.5 x 10-4 III. HF 6.8 x 10-4 Selected Answer: II &lt; III &lt; I. Correct Answer: I &lt; II &lt; III. Question 8 0 of 2 points Which of the following is the most effective buffer system for a pH value of 4.45? Selected Answer: HCO 3-/CO 3 2- (K 2 = 4.7 10-11 ) Correct Answer: HC 2 O 4-/C 2 O 4 2- (K 2 = 5.0 10-5 ) Question 9 0 of 4 points A 0.010 M aqueous solution of a weak acid HX has a pH of 5. What is the percentage dissociation of HX in the solution? Selected Answer: 0.001% Correct Answer: 0.1% Question 10 0 of 4 points What is the pOH of a 0.21 M solution of pyridine (K b = 1.4 10-9 ) at 25C? Selected Answer: 8.85 Correct Answer: 4.77...
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Question 1 - b = 1.8 10-5 ) is titrated with 0.1 M H 2 SO 4...

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