$pOH = 7 - 0.5 p K_{a} + 0.5 p K_{b}$ is true for an aqueous solution that has which pair of cations and anions amongst the following?

C_{6} H_{5} N H_{3}^{+}, C H_{3} C O O^{-}

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N H_{4}^{+}, F^{-}

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N a^{+}, C H_{3} C O O^{-}

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N H_{4}^{+}, C l^{-}

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Solution

The correct options are
A $C_{6} H_{5} N H_{3}^{+}, C H_{3} C O O^{-}$
B $N H_{4}^{+}, F^{-}$
$pOH = 7 - 0.5 p K_{a} + 0.5 p K_{b}$ , this equation for calculating $p O H$ is valid for salt of week acids and week bases
Now $(C_{6} H_{5} N H_{2}, C H_{3} C O O H$ ) and $(N H_{3}, H F)$
both are WA and WB pairs so this equation will be valid for them
In rest of the options, either the acid or the base is strong.

Suggest Corrections

Similar questions

pOH = 7 - 0.5 p K_{a} + 0.5 p K_{b}

p O H = 7 - 0.5 {p K}_{a} + 0.5 {p K}_{b}

p o H = 7 - 0.5 p K_{A} + 0.5 p K_{b}

C H_{3} C O O^{-}

O H^{-}

C l^{-}

N H_{4} O H

N H_{4} C l

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