Chemistry

Problem

A sample of the diprotic acid

H_2A

has

pK_{a1}=2.0

and

pK_{a2}=6.5

. Analysis shows that the singly deprotonated species

HA^-

is overwhelmingly predominant. Which pH range is most consistent with this observation? a) pH

\approx

2.0 b)

2.0 < \text{pH} < 6.5

c) pH > 6.5 d) pH < 2.0