Q15- Which of the following combinations would be the best to buffer the pH to 4.5? A) H₂PO4 and HPO4, K₁=6.2 x 108 B) HNO₂ and NO2, K₂=4.5 x 104 NH4 and NH3, K. = 5.7 × 10-10 D) CH3CO₂H and CH3COO, K₁= 1.8 x 10-5 Q16-Phosphoric acid (H3PO4) has pKar = 2.148, pKa2=7.198, pKa3 = 12.375. What is the value for HPO4?? A) 2.37 × 10² B) 4.51 x 10-10 C) 1.58 x 10-7 D) 1.41 x 10-12 01 ad
Q15- Which of the following combinations would be the best to buffer the pH to 4.5? A) H₂PO4 and HPO4, K₁=6.2 x 108 B) HNO₂ and NO2, K₂=4.5 x 104 NH4 and NH3, K. = 5.7 × 10-10 D) CH3CO₂H and CH3COO, K₁= 1.8 x 10-5 Q16-Phosphoric acid (H3PO4) has pKar = 2.148, pKa2=7.198, pKa3 = 12.375. What is the value for HPO4?? A) 2.37 × 10² B) 4.51 x 10-10 C) 1.58 x 10-7 D) 1.41 x 10-12 01 ad
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
pleasssseee sir solve parts 15 and 16
![07-13: The diprotic acid H₂L has Kar 1.4 x 10% and Kaz 1.2 x 10-10
97-Calculate the molarity of H" of 0.080 M HL solution
13-107 By 4.110 C) 1.3×10 D) 4.1 × 107
08-Calculate the molarity of Lof 0.080 M H₂L solution
A) 1.4-10 B) 1.2-10° C) 14×105 D) 1.2 × 10-¹0
09- Find the pH of a solution prepared by dissolving 0.85 g of NaHL (188.1 g/mol) and 1.05 g
of NaL (194.0 g/mol) in 250.0 mL of water.
C) 7.84
B) 9.00
D) 10.0
A) 10.84
Q10- The fraction of L2 (a of L2) at pH-12.00 is
B) 0.813
A) 0.923
C) 0.992 D) 0.089
Q11- At pH=5.85
A) [HL]-(H₂L] B) [L]> [H₂L]
C) [H₂L]>[HL]
D) [L²] = [HL]
Q12- At pH=7.89
A) [H₂L]=[1²]
B) [HL]= [H₂L]
C) [H₂L]> [HL]
D) [L²] = [HL]
Q13- Find the pH of a solution prepared by dissolving 0.85 g of H₂L (166.1 g/mol) and 1.05 g of
NaHL (188.1 g/mol) in 250.0 mL of water.
A) 4.81
B) 5.89
C) 4.89
D) 5.81
Q14- A 0.100 M solution of the weak acid HA has a pH of 2.36. Calculate pK, for HA.
2.36 B) 4.01 C) 1.66 D) 3.72
Q15- Which of the following combinations would be the best to buffer the pH to 4.5?
A) H₂PO, and HPO, K₁=6.2 × 108
B) HNO₂ and NO2, K.-4.5 x 104
NH4 and NH3, K₂ = 5.7 × 10-10
D) CH3CO₂H and CH3COO, K₁= 1.8 x 10-5
Q16-Phosphoric acid (H3PO4) has pKar = 2.148, pK2=7.198, pKas = 12.375. What is the value
for HPO4²?
A) 2.37 × 10²
%
B) 4.51 x 10-¹0
C) 1.58 x 10-7
D) 1.41 x 10-¹2
Q17- Find the pH of 0.20 M ammonia (NH3, K=1.76×105)
A) 11.27 B) 10.01 C) 11.36
D) 11.12](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbccdf819-703a-40ae-b479-32ba98a4eafe%2F1c6a38b9-4d35-472c-8b71-c39237a30d8b%2F7gk5as_processed.jpeg&w=3840&q=75)
Transcribed Image Text:07-13: The diprotic acid H₂L has Kar 1.4 x 10% and Kaz 1.2 x 10-10
97-Calculate the molarity of H" of 0.080 M HL solution
13-107 By 4.110 C) 1.3×10 D) 4.1 × 107
08-Calculate the molarity of Lof 0.080 M H₂L solution
A) 1.4-10 B) 1.2-10° C) 14×105 D) 1.2 × 10-¹0
09- Find the pH of a solution prepared by dissolving 0.85 g of NaHL (188.1 g/mol) and 1.05 g
of NaL (194.0 g/mol) in 250.0 mL of water.
C) 7.84
B) 9.00
D) 10.0
A) 10.84
Q10- The fraction of L2 (a of L2) at pH-12.00 is
B) 0.813
A) 0.923
C) 0.992 D) 0.089
Q11- At pH=5.85
A) [HL]-(H₂L] B) [L]> [H₂L]
C) [H₂L]>[HL]
D) [L²] = [HL]
Q12- At pH=7.89
A) [H₂L]=[1²]
B) [HL]= [H₂L]
C) [H₂L]> [HL]
D) [L²] = [HL]
Q13- Find the pH of a solution prepared by dissolving 0.85 g of H₂L (166.1 g/mol) and 1.05 g of
NaHL (188.1 g/mol) in 250.0 mL of water.
A) 4.81
B) 5.89
C) 4.89
D) 5.81
Q14- A 0.100 M solution of the weak acid HA has a pH of 2.36. Calculate pK, for HA.
2.36 B) 4.01 C) 1.66 D) 3.72
Q15- Which of the following combinations would be the best to buffer the pH to 4.5?
A) H₂PO, and HPO, K₁=6.2 × 108
B) HNO₂ and NO2, K.-4.5 x 104
NH4 and NH3, K₂ = 5.7 × 10-10
D) CH3CO₂H and CH3COO, K₁= 1.8 x 10-5
Q16-Phosphoric acid (H3PO4) has pKar = 2.148, pK2=7.198, pKas = 12.375. What is the value
for HPO4²?
A) 2.37 × 10²
%
B) 4.51 x 10-¹0
C) 1.58 x 10-7
D) 1.41 x 10-¹2
Q17- Find the pH of 0.20 M ammonia (NH3, K=1.76×105)
A) 11.27 B) 10.01 C) 11.36
D) 11.12
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