A diprotic acid (H2A) has pKa values of 4.66 (pKa1) and 9.32 (pKa2). Which of the following equalities is true when the pH is 4.66?
1. [HA-]= [A²-]
2. [H2A]=[HA-]
3. [H2A]=[H2A]=[A²-]