Which of the following are Bronsted acids as well as Bronsted bases?
${N H}_{3}, {H S O}_{4}^{-}, H_{2} {S O}_{4}, {H C O}_{3}^{-}, H_{3} O$

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Solution

$(1)$
$H_{2} O + N H_{3} \to N H_{4}^{+} + O H^{-}$ [ Base ]
$P H_{3} + N H_{3} \to N H_{2}^{-} + P H_{4}^{+}$ [ Acid ]
$(2)$
$H S O_{4}^{-} + H_{2} O \to H_{2} S O_{4} + O H^{-}$ [ Base ]
$H S O_{4}^{-} + N a O H \to S O_{4}^{2 -} + N a^{+} + H_{2} O$ [ Acid ]
$(3)$
$H_{2} S O_{4} + N a O H \to N a H S O_{4} + H_{2} O$ [ Acid ]
$(4)$
$H C O_{3}^{-} + N a O H \to N a_{2} C O_{3} + H_{2} O$ [ Acid ]
$H C O_{3}^{-} + H_{2} O \to H_{2} C O_{3} + O H^{-}$ [ Base ]
$(5)$
$H^{+} + H_{3} P \to P H_{4}^{+}$ [ Base ]
$P H_{3} \to P H_{2}^{-} + H^{+}$ [ Acid ]
$P H_{3}, N H_{3}, H S O_{4}^{-}$ and $H C O_{3}^{-}$ are bronsted acid as well as ball

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