![What are the reasons these Amino Acid "side-chain R groups" do not have a pKa? No pKa means that hydrogens can neither leave or attach to these amino acids, right? : r/chemhelp What are the reasons these Amino Acid "side-chain R groups" do not have a pKa? No pKa means that hydrogens can neither leave or attach to these amino acids, right? : r/chemhelp](https://preview.redd.it/what-are-the-reasons-these-amino-acid-side-chain-r-groups-v0-u0f7eauj89mb1.png?width=640&crop=smart&auto=webp&s=a43c05c8af1643082c8000954593bbc948be2205)
What are the reasons these Amino Acid "side-chain R groups" do not have a pKa? No pKa means that hydrogens can neither leave or attach to these amino acids, right? : r/chemhelp
![Twenty amino acids, grouped according to the character of their side... | Download Scientific Diagram Twenty amino acids, grouped according to the character of their side... | Download Scientific Diagram](https://www.researchgate.net/publication/251539854/figure/fig1/AS:1016888394018819@1619456494868/Twenty-amino-acids-grouped-according-to-the-character-of-their-side-chain-or-R-group.png)
Twenty amino acids, grouped according to the character of their side... | Download Scientific Diagram
![organic chemistry - When amino acids react with each other, how do you know which one reacts using it's carboxylic group and which one with it's amine group? - Chemistry Stack Exchange organic chemistry - When amino acids react with each other, how do you know which one reacts using it's carboxylic group and which one with it's amine group? - Chemistry Stack Exchange](https://i.stack.imgur.com/tJ5UK.jpg)