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  3. 1.) a diprotic acid has the following pk values: p

1.) A diprotic acid has the following pK values: pKa1 = 5.50, pKa2 = 9.50 a.) At...

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Chemistry

1.) A diprotic acid has the following pK values: pKa1= 5.50, pKa2 = 9.50

a.) At what pH does [H2A] = [HA- ]?

b.) At what pH does [HA- ] = [A2- ]?

c.) Which is the principal species at pH = 3.50, H2A,HA- , or A2- ? Justify your answer using theHenderson-Hasselbach equation.

d.) Which is the principal species at pH = 7.5, H2A,HA- , or A2- ? Justify your answer (don’t useHenderson-Hasselbach equation, this is a half-neutralized diproticacid).

e.) Which is the principal species at pH = 9.8, H2A,HA- , or A2-? Justify your answer using theHenderson-Hasselbach equation.

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