4. Answer the following questions using the below titration curve for H3PO4 (a triprotic acid). The titrant being added to the acid is NaOH. 14 Hd 12 10 00 6 4 2 0 0 0.5 1.5 Equivalents OH B) What is the approximate pKa value of HPO4²-? 2 A) Label all of the approximate pka points on the above curve. C) What is the dominant species of the titration mixture at pH = 4.5? 2.5 3

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4. Answer the following questions using the below titration curve for H3PO4 (a triprotic acid). The
titrant being added to the acid is NaOH.
14
Hd
12
10
00
6
4
0
0.5
1.5
Equivalents OH™
B) What is the approximate pKa, value of HPO42-?
2
A) Label all of the approximate pka points on the above curve.
C) What is the dominant species of the titration mixture at pH = 4.5?
2.5
3
Transcribed Image Text:4. Answer the following questions using the below titration curve for H3PO4 (a triprotic acid). The titrant being added to the acid is NaOH. 14 Hd 12 10 00 6 4 0 0.5 1.5 Equivalents OH™ B) What is the approximate pKa, value of HPO42-? 2 A) Label all of the approximate pka points on the above curve. C) What is the dominant species of the titration mixture at pH = 4.5? 2.5 3
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