Which species acts as stronger acid than formic acid in aqueous solution?

  • Option 1)

    CH3COOH

  • Option 2)

    H2SO4

  • Option 3)

    NH_{4}^{+}

  • Option 4)

    HPO_{4}^{2-}

 

Answers (1)

As learnt in

Ionization constant of weak acids -

Consider 

HX(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+\bar{X}(aq)
 

K_{a}=dissociation\:or\:ionization\:constant

- wherein

K_{a}=\frac{C^{2}\:\alpha ^{2}}{C(1-\alpha )}

K_{a}=\frac{C\alpha ^{2}}{1-\alpha }
 

C=initial\:concentration\:of\:undissociated\:acid

\alpha =extent\:upto\:which\:HX\:is\:ionized\:into\:ions.

 

The strength of an acid is determined by the stability of its conjugate base.

HSO_{4}^{-} has more delocalization of -ve charge than HCOO^{-} and is more stable

So H_{2}SO_{4} is stronger acid than HCOOH


Option 1)

CH3COOH

This solution is incorrect

Option 2)

H2SO4

This solution is correct

Option 3)

NH_{4}^{+}

This solution is incorrect

Option 4)

HPO_{4}^{2-}

This solution is incorrect

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