College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 31
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39209) A buffer solution with a pH of 4.31 is prepared with 1.0 M HC 2 H 3 O 2 and ________ M NaC 2 H 3 O 2 .
209)
The Ka of HC 2 H 3 O 2 is 1.8 × 10 –5 .
A) 0.37
B) 0.74
C) 4.2 × 10 -6
D) 8.8 × 10 -10
E) 0.18
210) A buffer solution with a pH of 4.63 is prepared with 0.14 M formic acid and ________ M sodium
210)
formate. The K a of formic acid is 1.8 × 10 –4 .
C) 5.4 × 10 -6
D) 3.0 × 10 -8
A) 1.1
B) 2.1
E) 0.54
211) A buffer solution with a pH of 4.40 is prepared with 0.78 M NaC 2 H 3 O 2 and
211)
________ M HC 2 H 3 O 2 . The K a of HC 2 H 3 O 2 is 1.8 × 10 –5 .
C) 4.1 × 10 4
A) 1.7
B) 3.5
D) 0.35
E) 0.86
212) A buffer solution with a pH of 4.78 is prepared with _________ M formic acid and 0.90 M sodium
212)
formate. The K a of formic acid is 1.8 x 10 –4 .
C) 3.3 × 10 3
A) 0.083
B) 0.17
D) 9.8
E) 0.041
213) How many milliliters of 0.0839 M NaOH are required to titrate 25.0 mL of 0.0990 M HBr to the
213)
equivalence point?
A) 29.5
B) 0.332
C) 4.57
D) 0.208
E) 21.2
214) A 25.0 mL sample of 0.150 M benzoic acid is titrated with a 0.150 M NaOH solution. What is the pH
214)
at the equivalence point? The K a of benzoic acid is 4.50 × 10 -4 .
A) 11.20
B) 9.80
C) 4.20
D) 7.00
E) 8.54
215) A 25.0-mL sample of 0.150 M hydrocyanic acid is titrated with a 0.150 M NaOH solution. What is
215)
the pH before any base is added? The K a of hydrocyanic acid is 4.9 × 10 -10 .
E) 3.1 × 10 8
B) 8.6 × 10 -6
A) 5.07
C) 9.31
D) 8.49
216) A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the
216)
pH after 26.0 mL of base is added? The K a of hydrazoic acid is 1.9 × 10 -5 .
A) 2.54
B) 11.47
C) 7.00
D) 4.70
E) 4.74
217) How many milliliters of 0.120 M NaOH are required to titrate 50.0 mL of 0.0998 M
217)
hypochlorous acid to the equivalence point? The K a of hypochlorous acid is 3.0 × 10 -8 .
A) 7.60
B) 50.0
C) 41.6
D) 60.1
E) 7.35
31
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