Consider the following titration curve: which is based on the following reaction
ID: 941967 • Letter: C
Question
Consider the following titration curve:
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 second dissociation of an H+ will play a large role in the pH level at point F
3. The pH at point D of the graph will be equal to pKa2
4. The pH at point E will be the average of pKa1 and pKa2
5. To the right of point F [A3-] > [HA2-]
Explanation / Answer
A:- True responses are,
1. H2A- will be a major species at point C of the graph,
2. The second dissociation of an H+ will play a large role in the pH level at point F,
5. To the right of point F is [A3-] > [HA2-] .