further chem
amino acids:

zwitterion: proton from carboxylic acid can transfer to basic amine group
hence: intermolecular forces are ionic bonding
can act as a buffer (lots of places to de/protonate)

pH at isoelectric point

derive by noticing that and use the definitions of the acid dissociation constant

join together to form proteins with amide/peptide linkages

proteins breaks through hydrolysis into separate amino acids

multiple peaks in IR for amines because asymmetric and symmetric stretching