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A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M  solution of NaOH. The pH of the solution was monitored throughout the titration, and the data were collected in the table below. Determine the Ka of the acid and use the data table to identify the unknown acid.

A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M  solution of NaOH. The pH of the solution was monitored throughout the titration, and the data were collected in the table below. Determine the Ka of the acid and use the data table to identify the unknown acid.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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  A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M  solution of NaOH. The pH of the solution was monitored throughout the titration, and the data were collected in the table below. Determine the Ka of the acid and use the data table to identify the unknown acid.
 

volume of OH- added (mL)                pH
0 3.09
5 3.65
10 4.10
15 4.50
17 4.55
18 4.71
19 4.94
20 5.11
21 5.37
22 5.93
22.2 6.24
22.6 9.91
22.8 10.2
23 10.4
24 10.8
25 11.0
30 11.5
40 11.8

 

Determine the Ka.  

 

Use the data table below to identify the name of the unknown acid.

 

 

Ka pKa
acetic 1
$$CH3​COOH(aq)+H2​O(l)H3​O+(aq)+CH3​COO−(aq)
 1.76x10-5 4.75
benzoic 1
$$C6​H5​COOH(aq)+H2​O(l)H3​O+(aq)+C6​H5​COO−(aq)
 6.25x10-5 4.20
formic 1
$$HCOOH(aq)+H2​O(l)H3​O+(aq)+HCOO−(aq)
 1.77x10-4 3.75
oxalic 1
$$HOOCCOOH(aq)+H2​O(l)H3​O+(aq)+HOOCCOO−(aq)
 5.9x10-2 1.23
  2
$$HOOCCOO−(aq)+H2​O(l)H3​O+(aq)+−OOCCOO−(aq)
 6.4x10-5 4.19
 
 
 
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