which is based on the following reactions: H 3 A ? H + + H 2 A - H 2 A - ? H + +

Question

which is based on the following reactions:
H3A ? H+ + H2A-
H2A- ? H+ + HA2-
HA2- ? H+ + A3-

How many of the following responses are true?

1. H2A- will be a major species at point C of the graph
2. The pH is only determined by the dissociation of a proton in the first equilibrium step of this titration curve
3. The pH at point F of the graph will be equal to pKa3
4. The pH at point E will be the average of pKa1 and pKa2
5. To the right of point F [A3-] > [HA2-]

5
3
2
0
1

Explanation / Answer

From the titration curve shown above,

True responses would be,

1

2

3

5

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