U tablici su navedene pKa\text{p}K_\text{a}$\text{p}K_\text{a}$ vrijednosti četiriju kiselina pri 25 °C. kiselinapKaHF3,20HCOOH3,70CH3COOH4,76HCN9,21\begin{array}{|c|c|} \hline \text{kiselina} & \text{p}K_\text{a} \\ \hline \text{HF} & 3{,}20 \\ \hline \text{HCOOH} & 3{,}70 \\ \hline \text{CH}_3\text{COOH} & 4{,}76 \\ \hline \text{HCN} & 9{,}21 \\ \hline \end{array}$\begin{array}{|c|c|} \hline \text{kiselina} & \text{p}K_\text{a} \\ \hline \text{HF} & 3{,}20 \\ \hline \text{HCOOH} & 3{,}70 \\ \hline \text{CH}_3\text{COOH} & 4{,}76 \\ \hline \text{HCN} & 9{,}21 \\ \hline \end{array}$ Koja od navedenih kiselina jednakih množinskih koncentracija ima najmanju pOH-vrijednost pri 25 °C?

A
HF\text{HF}$\text{HF}$
B
HCOOH\text{HCOOH}$\text{HCOOH}$
C
CH3COOH\text{CH}_3\text{COOH}$\text{CH}_3\text{COOH}$
D
HCN\text{HCN}$\text{HCN}$

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