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Oxyacids of Phosphorus

Conjugate bas...

Question

Conjugate base of $H_{2} P O_{4}^{-}$ is:

A

H_{3} P O_{4}

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B

P_{2} O_{5}

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C

P O_{4}^{3 -}

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D

H P O_{4}^{2 -}

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Solution

The correct option is D $H P O_{4}^{2 -}$
$H_{2} P O_{4}^{-} a c i d + H_{2} O \to H_{3} O^{+} + H P O_{4}^{2 -} conjugated base$
$H_{2} P O_{4}^{-}$ gives $H P O_{4}^{2 -}$ (conjugated base) in aqueous solutions. It acts as proton donor.
Note: An acid and its conjugate base differ by one proton only. An acid loses one proton to form a conjugate base.

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Q. Equivalent weight of

H_{3} P O_{4}

in each of the reaction will be respectively:

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

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

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

Q. Three reactions involving

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 -}

In which of the given does

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

Q. Calculate the pH of

0.1

M solution of (i)

N a H C O_{3}

N a_{2} H P O_{4}

N a H_{2} P O_{4}

C O_{2} + H_{2} O ⇌ H^{+} + C O_{3}^{2 -}

K_{1} = 4.2 \times 10^{- 7}

M

H C O_{3}^{-} ⇌ H^{+} + C O_{3}^{2 -}

K_{2} = 4.8 \times 10^{- 11}

M

H_{2} P O_{4} ⇌ H^{+} + H_{2} P O_{4}^{-}

K_{1} = 7.5 \times 10^{- 3}

M

H_{2} P O_{4}^{-} ⇌ H^{+} + H P O_{4}^{2 -}

K_{2} = 6.2 \times 10^{- 8}

M

H P O_{4}^{2 -} ⇌ H^{+} + P O_{4}^{3 -}

K_{3} = 1.0 \times 10^{- 12}

Q. 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}^{-}

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 -}

In which of the above does

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

act as an acid?

Q. The hydrolysis constant

K_{H}

for the reaction

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

1.4 \times 10^{- 12}

. The ionisation constant for

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

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