I'm really unsure what the difference is. We're using these when calculating $K$ of combined reactions. In general, I am also confused what $K$ is in comparison to $K_\mathrm{a}$ and $K_\mathrm{b}$. For example here is a calculation where for the reaction involving $\ce{NO2-}$, the equilibrium co...

I posted a question under the "2019 Moderator Election Q&A - Question Collection" which was not that well received, apparently because it was not considered to address practical aspects of moderation. However, I posted the question because I believe I approach the topic of "question and answer qu...

This is a question from CAIE! I need to understand why the secondary amine in serotonin molecule doesnot undergo condensation reaction with $CH_3COCl$ ? because as far as I know, there should be an amide formation for this reaction. Here's a picture of Serotonin: I must be lacking some inf...

The 2019 Community Moderator Election is now underway! Community moderator elections have three phases: Nomination phase Primary phase Election phase Most elections take between two and three weeks, but this depends on how many candidates there are. Please visit the official election page a...

In connection with the moderator elections, we are holding a Q&A thread for the candidates. Questions collected from an earlier thread have been compiled into this one, which shall now serve as the space for the candidates to provide their answers. Not every question was compiled - as noted, we ...