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  • Caculate the ratio of [HCOONa] and [HCOOH] in a buffer of pH 4.25. (Given Ka of HCOOH = 1.8 <img alt="\times" src="http://entrancecorner.oncodecogs.com/gif.latex?%5Ctimes"

Caculate the ratio of [HCOONa] and [HCOOH] in a buffer of pH 4.25. (Given Ka of HCOOH = 1.8 \times 10-4)

 

Option: 1

3.74


Option: 2

3.24


Option: 3

7.99


Option: 4

0.51


Answers (1)

best_answer

In order to obtain a buffer solution of pH = 4.25, we have:

\mathrm{p K_{a}=-\log \left(1.8 \times 10^{-4}\right)=3.74}
\begin{aligned}\\ 4.25=& 3.74+\log \left[\frac{\text { Salt }}{\mathrm{Acid}}\right] \\ \frac{\text { Salt }}{\text { Acid }} &=\text { antilog }(4.25-3.74) \\ &=\text { antilog }(0.51)=3.24 \end{aligned}

Therefore,option(2) is correct

Posted by

rishi.raj

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