Question

Consider the acid dissociation behavior of carbonic acid, H 2 CO 3 . A p H gradient from 0 to 14 is given. Below a p H equal to p K a 1 which is 6.351, the predominant form is H 2 C O 3. Above a p H equal to p K a 2 which is 10.329, the predominant form is C O 3 2 minus. Between the two p K a values, the predominant form is H C O 3 minus. What is the predominant species present at pH 6.73 ?

Answer 1

Complete Question

The complete question is shown on the first uploaded image

Answer:

The predominate specie is $HCO_3^-$

Explanation:

From the question we can see that $pk_{a1}(6.351) < pH(6.73) pk_{a2}(10.329)$

Hence looking at the question we can see that the predominant specie is $HCO_3^-$