Question

What is the conjugate acid of each base?

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

b.

c.

d.

Short answer

a. ${\mathrm{H}}_2{\mathrm{CO}}_3$

b. role="math" localid="1649075555384" ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\stackrel{+}{\mathrm{N}}{\mathrm{H}}_2{\mathrm{CH}}_3$

c. ${\mathrm{CH}}_3\stackrel{+}{\mathrm{O}}{\mathrm{HCH}}_3$

d. ${\mathrm{CH}}_3\mathrm{COOH}$

Step-by-step solution

Base

A base can abstract the acidic proton from the acid.

Conjugate acid

The conjugate acid is formed through the proton abstraction by a base.

Formation of the conjugate acid

a.The base ${\mathrm{HCO}}_3^{-}$abstracts the proton and forms its conjugate acid ${\mathrm{H}}_2{\mathrm{CO}}_3$.

${\mathrm{HCO}}_3^{-}\stackrel{{\mathrm{H}}^{+}}{\to }{\mathrm{H}}_2{\mathrm{CO}}_3$

b. The base ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{NHCH}}_3$abstracts the proton and forms its conjugate acid ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\stackrel{+}{\mathrm{N}}{\mathrm{H}}_2{\mathrm{CH}}_3$.

Formation of a conjugate acid

c.The base ${\mathrm{CH}}_3{\mathrm{OCH}}_3$abstracts the proton and forms its conjugate acid ${\mathrm{CH}}_3\stackrel{+}{\mathrm{O}}{\mathrm{HCH}}_3$.

Formation of a conjugate acid

d.The base ${\mathrm{CH}}_3{\mathrm{COO}}^{-}$abstracts the proton and forms its conjugate acid ${\mathrm{CH}}_3\mathrm{COOH}$.

Formation of a conjugate acid