General Chemistry Question Thread 2

[gridiron]

This is a continuation of the original General Chemistry Thread.

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[PiBond]

I am sorry for reviving a 3 year old thread as I cannot find the justification for creating a new thread just for one question.


Can someone please help me understand why ammonium cation (NH4 +) cannot exist at a pH of 10. The Berk Review says it's because it has a pKa value less than 10. Was I supposed to know this information as background knowledge? The problem didn't provide a pka chart or any pertinent information leading to this conclusion.

Thanks in advance.

Yes, that is background knowledge to know for the MCAT. Also know pka's for carboxylic acids, alpha hydrogens, alcohols (ie ethanol). Those will help significantly.

 

[ScoobyDooo]

Thank you for the help!