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If a buffer solution of 2,4-dinitrophenol has a pH of 5, what is the ratio of dissociated to undissociated molecules of 2,4-dinitrophenol in the solution? (p $K_{a}$ of 2,4-dinitrophenol = 4)
10

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Solution

The correct option is A 10
pH= p $K_{a}$ + log $\frac{[c o n j u g a t e b a s e]}{[a c i d]}$

5 = 4 + log $\frac{[c o n j u g a t e b a s e]}{[a c i d]}$

log $\frac{[c o n j u g a t e b a s e]}{[a c i d]}$ = 1

$\frac{[c o n j u g a t e b a s e]}{[a c i d]}$ = $\frac{[d i s s o c i a t e d]}{[u n d i s s o c i a t e d]}$ = 10

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