The Bronsted acid which gives the weakest conjugate base is:
$H_{2} S$
$H F$
$H_{2} O$
$H C l$

H_{2} S

H F

H_{2} O

H C l

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The Bronsted acid which gives the weakest conjugate base is:

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What will be the conjugate bases for the Bronsted acids

H F, H_{2} {S O}_{4}

and

{H C O}_{3}^{-}

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(a) Mention conjugate base of each of the following:

H S^{-}, H_{3} O^{+}, H_{2} {P O}_{4}^{-}, H {S O}_{4}^{-}, H F, {C H}_{3} C O O H, C_{6} H_{5} O H, H C l O_{4}, {N H}_{4}^{+}

(b) Mention the conjugate acid of each of the following:

{O H}^{-}, {C H}_{3} C O O^{-}, {C l}^{-}, {C O}_{3}^{2 -}, H_{2} {P O}_{4}^{-}, {C H}_{3} {N H}_{2}, {C H}_{3} C O O H, {N H}_{2}^{-}

H_{2} O, H {C O}_{3}^{-}, H_{2} {S O}_{4}, H_{3} {P O}_{4}, H S^{-}, {N H}_{3}

(d) Which is stronger acid in each of the following pairs?

H C l, H I; H_{2} {C O}_{3}, H_{2} {S O}_{4}; H_{2} O, H_{2} S; C_{2} H_{5} O H, C_{6} H_{5} O H

(e) Which is stronger base in each of the following pairs?

{O H}^{-}, {C l}^{-}; {O H}^{-}, {N H}_{2}^{-}; {O H}^{-}, {C H}_{3} C O O^{-}; {C H}_{3} C O O^{-}, {C l}^{-}; {N H}_{3}, {C H}_{3} {N H}_{2}

(f) Classify the following into acids and bases according to Lewis concept:

S^{2 -}, H^{+}, {O H}^{-}, B F_{3}, {N i}^{2 +}, N F_{3}, A l {C l}_{3}, S n {C l}_{4}, {N H}_{3}, {({C H}_{3})}_{2} O

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Conjugate base for Bronsted acids

H_{2} O

and

H F

are :

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The species:

H_{2} O, {H C O}_{3}^{-}, {H S O}_{4}^{-}

and

{N H}_{3}

can act both as Bronsted acids and bases. For each case give the corresponding conjugate acid and base.

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The Bronsted acid which gives the weakest conjugate base is:H2SHFH2OHCl