Answer
a. $H_2CO_3/HC{O_3}^-$ and $H_3O^+/H_2O$
b. $NH_4^+/NH_3$ and $H_3O^+/H_2O$
c. $HCN/CN^-$ and $HNO_2/NO{_2}^-$
d. $HF/F^-$ and $HCHO_2/CHO{_2}^-$
Work Step by Step
1. Identify the reactant that acts as an acid, and what it turns after donating a proton.
a. $H_2CO_3 \longrightarrow HC{O_3}^-$
b. $NH{_4}^+ \longrightarrow NH_3$
c. $HCN \longrightarrow CN^-$
d. $HF \longrightarrow F^-$
- These are the first acid-base pairs.
2. Identify the reactant that act as a base, and its conjugate acid.
a. $H_2O \longrightarrow H_3O^+$
b. $H_2O \longrightarrow H_3O^+$
c. $NO{_2}^- \longrightarrow HNO_2$
d. $CHO{_2}^- \longrightarrow HCHO_2$
