Question

question 15.8
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match each compound from the premise column with the correct description from the response column.
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h₂o
mno₂
sno
hs⁻
both amphiprotic and amphoteric
amphoteric only
both amphiprotic and amphoteric
amphoteric only
amphoteric only
both amphiprotic and amphoteric
amphiprotic only

Explanation:

1. H₂O: Can donate a proton (acts as acid: $\text{H}_2\text{O}

ightarrow \text{H}^+ + \text{OH}^-$) and accept a proton (acts as base: $\text{H}_2\text{O} + \text{H}^+
ightarrow \text{H}_3\text{O}^+$), so it is amphiprotic. Amphiprotic substances are a subset of amphoteric substances, meaning it is both.

1. MnO₂: Transition metal oxide that reacts with both strong acids (e.g., $\text{MnO}_2 + 4\text{HCl}

ightarrow \text{MnCl}_2 + \text{Cl}_2 + 2\text{H}_2\text{O}$) and strong bases (e.g., $\text{MnO}_2 + 2\text{NaOH}
ightarrow \text{Na}_2\text{MnO}_3 + \text{H}_2\text{O}$) but cannot donate/accept protons, so it is amphoteric only.

1. SnO: Metal oxide that reacts with strong acids (e.g., $\text{SnO} + 2\text{HCl}

ightarrow \text{SnCl}_2 + \text{H}_2\text{O}$) and strong bases (e.g., $\text{SnO} + 2\text{NaOH}
ightarrow \text{Na}_2\text{SnO}_2 + \text{H}_2\text{O}$) but cannot donate/accept protons, so it is amphoteric only.

1. HS⁻: Can donate a proton (acts as acid: $\text{HS}^-

ightarrow \text{H}^+ + \text{S}^{2-}$) and accept a proton (acts as base: $\text{HS}^- + \text{H}^+
ightarrow \text{H}_2\text{S}$), so it is amphiprotic, and therefore both amphiprotic and amphoteric.

Answer:

• $\text{H}_2\text{O}$ = both amphiprotic and amphoteric
• $\text{MnO}_2$ = amphoteric only
• $\text{SnO}$ = amphoteric only
• $\text{HS}^-$ = both amphiprotic and amphoteric