Question

question 7
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match each compound from the premise column with the correct description from the response column.
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$h_2o$
both amphiprotic and amphoteric
$mno_2$
amphoteric only
$sno$
both amphiprotic and amphoteric
$hs^-$
amphoteric only
amphoteric only
amphiprotic only
both amphiprotic and amphoteric

Explanation:

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

ightarrow \text{H}^+ + \text{OH}^-$) and accept a proton (acts as Brønsted base: $\text{H}_2\text{O} + \text{H}^+
ightarrow \text{H}_3\text{O}^+$), so it is amphiprotic. It also reacts with both strong acids and strong bases (e.g., with $\text{HCl}$ to form $\text{H}_3\text{O}^+$, with $\text{Na}$ to form $\text{NaOH}$), so it is amphoteric.

1. MnO₂: Is a 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 (in fused conditions, $\text{MnO}_2 + 2\text{NaOH}
ightarrow \text{Na}_2\text{MnO}_3 + \text{H}_2\text{O}$), but it cannot donate or accept protons, so it is amphoteric only.

1. SnO: Is a metal oxide that reacts with strong acids ($\text{SnO} + 2\text{HCl}

ightarrow \text{SnCl}_2 + \text{H}_2\text{O}$) and strong bases ($\text{SnO} + 2\text{NaOH}
ightarrow \text{Na}_2\text{SnO}_2 + \text{H}_2\text{O}$), but it has no protons to donate, so it is amphoteric only.

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

ightarrow \text{H}^+ + \text{S}^{2-}$) and accept a proton ($\text{HS}^- + \text{H}^+
ightarrow \text{H}_2\text{S}$), so it is amphiprotic. It also acts as an amphoteric species by reacting with both strong acids and bases, so it is 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