The conjugate base of H_{2}PO{_{4}}^{-} is

  • Option 1)

    PO{_{4}}^{3-}

  • Option 2)

    P_{2}O_{5}

  • Option 3)

    H_{3}PO_{4}

  • Option 4)

    HPO{_{4}}^{2-}

 

Answers (1)

As we learnt in

Conjugate acid base pair -

If bronsted acid is a strong acid then its conjugate base is a weak base and vice versa.

- wherein

HCl+H_{2}O\rightleftharpoons H_{3}O^{+}+Cl^{-}

Cl- is conjugate base of  HCl  &  H3O+  is conjugate acid of  H2O.

 

 

 

Conjugate base is formed by the removal of H^{+} from acid

H_{2}PO_{4}^{-}\rightarrow HPO{_{4}}^{2-}+H^{+}

HP0_{4}^{-2} is a conjugate base of H_{2}PO_{4}^{-}

 

 

 

 

  

 


Option 1)

PO{_{4}}^{3-}

This answer is incorrect.

Option 2)

P_{2}O_{5}

This answer is incorrect.

Option 3)

H_{3}PO_{4}

This answer is incorrect.

Option 4)

HPO{_{4}}^{2-}

This answer is correct.

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