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  4. Which of the following will not be soluble in sodium hydrogen carbonate?

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Q. Which of the following will not be soluble in sodium hydrogen carbonate?

NTA AbhyasNTA Abhyas 2020

Solution:

Solution

2.4.6-Trinitro phenol, benzoic acid and benzene sulphonic acid are sobuble in $\text{NaH}\text{O}_{3}$ .

$\text{Acid}+\text{NaHC}\text{O}_{3} \rightarrow \text{salt}+H_{2}\text{C}\text{O}_{3}$

Reaction is possible in forward direction if acid is more acidic then $H_{2}\text{C}\text{O}_{3}.$

O-nitrophenol is less acidic than $H_{2}\text{C}\text{O}_{3}$ so it is not soluble in sodium hydrogen carbonate.

$H_{2}CO_{3}$ is more acidic then Solution and reaction proceed in strong acid to weak acid so, above reaction is not feasible forward direction