A titration of 35.0 mL of an unknown tribasic salt, Li₂A, requires 90.00 mL of 0.250 M HCI to reach the 3rd equivalence point. The titration data is shown below: Vol of HCI (mL) 15.00 30.00 45.00 60.00 75.00 90.00 10.45 8.62 6.79 4.86 2.93 1.35 pH Which conjugates are equal in concentrations at midpoint 2? A) [H₂A]=[H₂A] B) [A²]=[H₂A] C) [H₂A]=[HA²] D) [HA²]=[A³] E) None of these
A titration of 35.0 mL of an unknown tribasic salt, Li₂A, requires 90.00 mL of 0.250 M HCI to reach the 3rd equivalence point. The titration data is shown below: Vol of HCI (mL) 15.00 30.00 45.00 60.00 75.00 90.00 10.45 8.62 6.79 4.86 2.93 1.35 pH Which conjugates are equal in concentrations at midpoint 2? A) [H₂A]=[H₂A] B) [A²]=[H₂A] C) [H₂A]=[HA²] D) [HA²]=[A³] E) None of these
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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![**Titration of Unknown Tribasic Salt**
A titration of 35.0 mL of an unknown tribasic salt, \(Li_3A\), requires 90.00 mL of 0.250 M HCl to reach the 3rd equivalence point. The titration data is shown below:
| Vol of HCl (mL) | 15.00 | 30.00 | 45.00 | 60.00 | 75.00 | 90.00 |
|-----------------|-------|-------|-------|-------|-------|-------|
| pH | 10.45 | 8.62 | 6.79 | 4.86 | 2.93 | 1.35 |
**Question:**
Which conjugates are equal in concentrations at midpoint 2?
**Options:**
A) \([H_3A] = [H_2A^-]\)
B) \([A^{2-}] = [H_2A^-]\)
C) \([H_2A^-] = [HA^{2-}]\)
D) \([HA^{2-}] = [A^{3-}]\)
E) None of these
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This educational content explains how to determine the concentration equality of conjugates at the second titration midpoint using titration data for a tribasic salt.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa91f799b-1b33-41a5-8f4e-af83231854b4%2F2594d7a6-659b-449d-9425-dd7aba4b96dd%2F7ktj77_processed.png&w=3840&q=75)
Transcribed Image Text:**Titration of Unknown Tribasic Salt**
A titration of 35.0 mL of an unknown tribasic salt, \(Li_3A\), requires 90.00 mL of 0.250 M HCl to reach the 3rd equivalence point. The titration data is shown below:
| Vol of HCl (mL) | 15.00 | 30.00 | 45.00 | 60.00 | 75.00 | 90.00 |
|-----------------|-------|-------|-------|-------|-------|-------|
| pH | 10.45 | 8.62 | 6.79 | 4.86 | 2.93 | 1.35 |
**Question:**
Which conjugates are equal in concentrations at midpoint 2?
**Options:**
A) \([H_3A] = [H_2A^-]\)
B) \([A^{2-}] = [H_2A^-]\)
C) \([H_2A^-] = [HA^{2-}]\)
D) \([HA^{2-}] = [A^{3-}]\)
E) None of these
---
This educational content explains how to determine the concentration equality of conjugates at the second titration midpoint using titration data for a tribasic salt.
Expert Solution
Step 1: Define pH
The question is based on the concept of pH of the solution. It is defined as a negative logarithm of hydrogen ion concentration present in a solution.
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