Three reactions involving H2PO-4 are given below-I- H3PO4-H2O- H3O- - H2PO4-II- H2PO4-H2O- HPO2-4 - H3O-III- H2PO4-OH- H3PO4-O2-In which of the above does H2PO4- act as an acid-

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Bronsted Lowry Theory

Three reactio...

Question

Three reactions involving $H_{2} P O_{4}^{-}$ are given below.
I. $H_{3} P O_{4} + H_{2} O \to H_{3} O^{+} + H_{2} P O_{4}^{-}$
II. $H_{2} P O_{4}^{-} + H_{2} O \to H P O_{4}^{2 -} + H_{3} O^{+}$
III. $H_{2} P O_{4}^{-} + O H^{-} \to H_{3} P O_{4} + O^{2 -}$
In which of the above does $H_{2} P O_{4}^{-}$ act as an acid?

II only

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I and II

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III only

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I only

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Solution

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H_{3} P O_{4}

H_{3} P O_{4} + H_{2} O ⇋ H_{3} O^{+} + H_{2} P O_{4}^{-}

H_{2} P O_{4}^{-} + H_{2} O ⇋ H P O_{4}^{2 -} + H_{3} O^{+}

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

H_{2} P O_{4}^{-}

H_{2} P O_{4}^{-}

H_{2} 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 -}

H_{2} P O_{4}^{-}

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 -}

H_{2} P O_{4}^{-}

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 P O_{4}^{2 -}; p K_{2} = 7.20

p H

0.01 M N a H_{2} P O_{4}

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 P O_{4}^{2 -}, p^{k_{2}} = 7.20

p^{H}

N a H_{2} P O_{4}

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