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Salt of Weak Acid and Strong Base

What is the c...

Question

What is the conjugate acid of ${H_{2} {P O}_{4}}^{2 -}$ ?

H_{3} P O_{4}

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{H_{2} {P O}_{4}}^{2 -}

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H_{3} O^{+}

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{P O}_{4}^{3 -}

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Solution

The correct option is A $H_{3} P O_{4}$
The conjugate acid should have one extra proton than its corresponding base.
The conjugate acid of $H_{2} {P O}_{4}^{-}$ is $H_{3} {P O}_{4}$ which have one proton more than the base.

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Similar questions

H_{2} O + H_{3} {P O}_{4} ⇌ H_{3} O^{+} + H_{2} {P O}_{4}^{-}; p K_{1} = 2.15

H_{2} O + H_{2} {P O}_{4}^{-} ⇌ H_{3} O^{+} + H_{2} {P O}_{4}^{2 -}; p K_{2} = 7.20

0.01 M

N a H_{2} {P O}_{4}

K_{a_{1}}, K_{a_{2}}, K_{a_{3}}

H_{3} {P O}_{4}

10^{- 3}, 10^{- 8}, 10^{- 12}

K_{w} (H_{2} O) = 10^{- 14}

H {P O}_{4}^{2 -}

K_{b}

H {P O}_{4}^{2 -}

K_{b}

H_{2} {P O}_{4}^{2 -}

K_{b}

{P O}_{4}^{3 -} (K_{b_{3}}), H {P O}_{4}^{2 -} (K_{b_{2}})

H_{2} {P O}_{4}^{-} (K_{b_{1}})

[H^{+}]

H_{3} P O_{4}

H_{3} {P O}_{4} ⇌ H^{+} + H_{2} {P O}_{4}^{-} {K a}_{1} = 10^{- 4}

H_{2} {P O}_{4}^{-} ⇌ H^{+} + H {P O}_{4}^{- 2} {K a}_{2} = 10^{- 9}

H {P O}_{4}^{- 2} ⇌ H^{+} + {P O}_{4}^{3 -} {K a}_{3} = 10^{- 13}

H_{3} {P O}_{4}, H_{2} {S O}_{4}, H_{3} {P O}_{3}, H_{2} {C O}_{3}, H_{2} S_{2} O_{7}, H_{3} B O_{3}, H_{3} {P O}_{2}, H_{2} {C r O}_{4}, H_{2} {S O}_{3}

H_{2} {P O}_{4}^{-}

H_{3} {P O}_{4} + H_{2} O \to H_{3} O^{+} + H_{2} {P O}_{4}^{-}

H_{2} {P O}_{4}^{-} + H_{2} O \to H {P O}_{4}^{2 -} + H_{3} O^{+}

H_{2} {P O}_{4}^{-} + {O H}^{-} \to H_{3} {P O}_{4} + O^{2 -}

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