1.

Explain the strengths of conjugate acid base pairs of the following species. (a) HSO_(4)^(-) (b) NH_(3) (c) HS^(-) (d) ClO_(4)^(-)

Answer»

Solution :(a) `HSO_(4)^(-) RARR SO_(4)^(-2)`
`H_(2)SO_(4)` is a STRONG acid, `HSO_(4)^(-)` is a strong weak conjugate base. So, `HSO_(4)^(-)` is a strong acid, so, its conjugate base `SO_(4)^(-2)` is weak
(b) `NH_(3) + H^(+) rarr NH_(4)^(+)`
As ammonia is a weak base its conjugate acid is strong.
(C) `HS^(-) rarr S^(-2)`
`H_(2)S` is a weak acid. `HS^(-)` is a strong conjugate base So, `HS^(-)` is weak acid so its conjugate base `5^(-2)` is strong
(d) `ClO_(4)^(-) rarr HClO_(4)`
`ClO_(4)^(-)` is the conjugate base of strong acid `HClO_(4)`. As `ClO_(4)^(-)` is the conjgate base of strong acid it has to be weak


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