Question

What is the conjugate base of each acid?

a. ${\mathbf{\text{HCO}}}^{\mathbf{3}\mathbf{-}}$

b.

c.

d.

Short answer

a. ${\text{CO}}_3^{2-}$

b. role="math" localid="1649233356230" ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CH(NH}}_{\text{2}}{\text{)CH}}_{\text{3}}$

c. ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{COO}}^{-}$

d. ${\text{C}}_8{\text{H}}_{11}^{-}$

Step-by-step solution

Acid

An acid releases the acidic proton and forms its conjugate base.

Conjugate base

The conjugate base is formed by the proton release from an acid.

Formation of the conjugate base

a. The acid ${\text{HCO}}^{3-}$ releases the proton and forms its conjugate base ${\text{CO}}_3^{2-}$.

b. The acid ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CH(NH}}_3^{+}{\text{)CH}}_{\text{3}}$ releases its proton and forms its conjugate base ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CH(NH}}_{\text{2}}{\text{)CH}}_{\text{3}}$.

Conjugate base

c. The acid ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{COOH}$ releases its proton and forms its conjugate acid ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{COO}}^{-}$.

Conjugate base

d. The acid ${\text{C}}_8{\text{H}}_{12}$ the proton and forms its conjugate acid ${\text{C}}_8{\text{H}}_{11}^{-}$.

Conjugate base