9- A buffer system is set up with 3[HA]-[A] If pK a=5.5, what is the pH of the buffer? a. 5.2 b. 3.5 c. 5.3 d. 6.0 e. 7.5

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
icon
Related questions
Question
Q 9 please
Q1:Chose the correct answer from the following
1-The [HO] in a 0.050 M solution of Ba(OH), is:
(a) 1.0 x 10' M (b) 5.0 x 10 M (c) 10 x 10 M (d) 5.0 x 10" M
2-The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pK, of this acid?
(a) 5.7 (b) 4.9
(d) 28
(c) 3.7
3-Which of the following solutions has the lowest pH at 25°C? (No calculations required.)
(a) 0.2 M sodium hydroxide (b) 0.2 M hypochlorous acid (c) 02 M ammonia (d) 0.2 M benzoic
acid (e) pure water
4-The pH of 0.15 M trimethylammonium chloride, (CH)NHCI, a salt, is 5.34. What is the percent
hydrolysis?
(a) 0,003% (b) 0.0068%
(c) 0.0094 %
(c) 0.022%
(d) 0.011 %
5-How many grams of NaF would have to be added to 2.00 L of 0.100 M HF to yield a solution with a pH
is 4.00% mw for NaF is 41.98 g/mol) Ka for HF 1.4 10
(a) 300 g
(b) 36 g
(c) 0.84 g
(d) 6.9 g
(c) 60. g
6-Calculate the pH of the solution resulting from the addition of 20.0 mL of 0.100 M NaOH to 30.0 ml. of
0.100 M HNO,
(a) 1.35
(b) 1.70
(c) 1.95
(d) 2.52
(c) 2.80
7-Consider the titrations of the pairs of aqueous acids and bases listed on the left. For which pair is the pH
at the equivalence point stated incorrectly?
Acid-Base Pair
tai
balls
(b) HNO-Ca(OH)
(e) 2.0 x 10¹ M
(HCIO, -NaOH
id) HCO NaOH
KHOA
pH at Equivalence Point
less than 7
(a) strong, strong
(b) weak, strong
(c) strong, weak
(d) weak, weak
(e) none of these
less than 7
8-The following titration curve is the kind of curve expected for the titration of a
base
pH 71
acid with a
mL added
9- A buffer system is set up with 3[HA] =[A]. If pK a -5.5, what is the pH of the buffer?
c. 5.3
a. 5.2
b. 3.5
d. 6.0
e. 7.5
10-If 25.00 ml of 0.1M NaOH solution is needed to reach the end point of 10 ml HNO₂. Then the concentration of
HNO, in ppm is: [M.wt. of HNO,-63 g/mol]
a. 9.45-10 ppm
b. 14.70×10 ppm
c. 7.30-10¹ ppm
d. 1.5750×10 ppm
Transcribed Image Text:Q1:Chose the correct answer from the following 1-The [HO] in a 0.050 M solution of Ba(OH), is: (a) 1.0 x 10' M (b) 5.0 x 10 M (c) 10 x 10 M (d) 5.0 x 10" M 2-The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pK, of this acid? (a) 5.7 (b) 4.9 (d) 28 (c) 3.7 3-Which of the following solutions has the lowest pH at 25°C? (No calculations required.) (a) 0.2 M sodium hydroxide (b) 0.2 M hypochlorous acid (c) 02 M ammonia (d) 0.2 M benzoic acid (e) pure water 4-The pH of 0.15 M trimethylammonium chloride, (CH)NHCI, a salt, is 5.34. What is the percent hydrolysis? (a) 0,003% (b) 0.0068% (c) 0.0094 % (c) 0.022% (d) 0.011 % 5-How many grams of NaF would have to be added to 2.00 L of 0.100 M HF to yield a solution with a pH is 4.00% mw for NaF is 41.98 g/mol) Ka for HF 1.4 10 (a) 300 g (b) 36 g (c) 0.84 g (d) 6.9 g (c) 60. g 6-Calculate the pH of the solution resulting from the addition of 20.0 mL of 0.100 M NaOH to 30.0 ml. of 0.100 M HNO, (a) 1.35 (b) 1.70 (c) 1.95 (d) 2.52 (c) 2.80 7-Consider the titrations of the pairs of aqueous acids and bases listed on the left. For which pair is the pH at the equivalence point stated incorrectly? Acid-Base Pair tai balls (b) HNO-Ca(OH) (e) 2.0 x 10¹ M (HCIO, -NaOH id) HCO NaOH KHOA pH at Equivalence Point less than 7 (a) strong, strong (b) weak, strong (c) strong, weak (d) weak, weak (e) none of these less than 7 8-The following titration curve is the kind of curve expected for the titration of a base pH 71 acid with a mL added 9- A buffer system is set up with 3[HA] =[A]. If pK a -5.5, what is the pH of the buffer? c. 5.3 a. 5.2 b. 3.5 d. 6.0 e. 7.5 10-If 25.00 ml of 0.1M NaOH solution is needed to reach the end point of 10 ml HNO₂. Then the concentration of HNO, in ppm is: [M.wt. of HNO,-63 g/mol] a. 9.45-10 ppm b. 14.70×10 ppm c. 7.30-10¹ ppm d. 1.5750×10 ppm
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

Blurred answer
Knowledge Booster
Acid-Base Titrations
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
  • SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY