Answer
a. Br- ion is the conjugate base of HBr.
b. $HCO_{3}$- ion is the conjugate base of $H_{2}CO_{3}$.
c. $ClO_{4}$- ion is the conjugate base of $HClO_{4}$.
d. $C_{2}H_{3}O_{2}$- ion is the conjugate base of $HC_{2}H_{3}O_{2}$.
Work Step by Step
a. Br- ion is the conjugate base of HBr because it can accept a hydrogen proton.
b. $HCO_{3}$- ion is the conjugate base of $H_{2}CO_{3}$ because it can accept a hydrogen proton.
c. $ClO_{4}$- ion is the conjugate base of $HClO_{4}$ because it can accept a hydrogen proton.
d. $C_{2}H_{3}O_{2}$- ion is the conjugate base of $HC_{2}H_{3}O_{2}$ because it can accept a hydrogen proton.
