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  •  and <img alt="\mathrm{F^-}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathr

\mathrm{HF} and \mathrm{F^-} represent a conjugate acid base pair. 

Which of the following is correct relation between \mathrm{k_a\ of\ HF} and \mathrm{k_b\ of\ F^-} at temperature T? 

(Given, at Temperature T, the self ionisation constant of Water is 10^{-12})

Option: 1

\mathrm{pk_a + pk_b =12}


Option: 2

\mathrm{pk_a + pk_b =14}


Option: 3

\mathrm{pk_a + pk_b =6}


Option: 4

\mathrm{pk_a + pk_b =7}


Answers (1)

best_answer

As we learnt, 

For a conjugate acid-base pair,

\mathrm{k_a \times k_b =k_w}

\Rightarrow \mathrm{pk_a + pk_b =pk_w =12}

\left [ \because \text{At Temperature T K, } \mathrm{k_w =10^{-12}} \right ]

Thus, the correct answer is Option (1)

Posted by

vishal kumar

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