How To find which organic compound gives effervescence when reacts with $\ce{NaHCO3}$? Specially in case of phenols, which one reacts and which does not? According to my professor, all acids stronger than $\ce{H2CO3}$ evolve $\ce{CO2}$ when treated with $\ce{NaHCO3}$. But I do not understand how to find which acid is stronger than $\ce{H2CO3}$, further how to find same for $\ce{Na}$ and $\ce{NaOH}$ especially when the pKa values are not given in question.

How to solve this type of questions?

  • $\begingroup$ You can assume that the phenols are less acidic than $\ce{H2CO3}$. $\endgroup$ – DHMO Jan 16 '17 at 14:44
  • $\begingroup$ What about substituted phenols like nitro Phenols etc.? $\endgroup$ – Piyush Raut Jan 16 '17 at 14:45
  • $\begingroup$ Good point. 2,4-dinitrophenol is a stronger acid than $\ce{H2CO3}$. $\endgroup$ – DHMO Jan 16 '17 at 14:47
  • $\begingroup$ Are there many such compounds that I will have to remember or just few exceptions? $\endgroup$ – Piyush Raut Jan 16 '17 at 14:48
  • $\begingroup$ What exactly does your question look like? $\endgroup$ – DHMO Jan 16 '17 at 14:53

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