Hi I am having trouble drawing the structures for amino acids when it asks for the Isoelectric point. They give me a chart with the pk1, pk2 and pkr sometimes
13. What is the isoelectric point of tyrosine?

a)2.20 b)5.67 c. 9.11 d.10.07 e. 7.13
They make a picture, but IDK how to make the picture

Question

Hi I am having trouble drawing the structures for amino acids when it asks for the Isoelectric point. They give me a chart with the pk1, pk2 and pkr sometimes
13. What is the isoelectric point of tyrosine? 

a)2.20  b)5.67    c. 9.11      d.10.07      e. 7.13 
They make a picture, but IDK how to make the picture

anonymous · Answer

the picture looks like this

anonymous · Answer

I know how to find it with the pictures given, but idk how to make it from scratch like they do

aaronq · Answer

wanna post it as a pdf file?

aaronq · Answer

to get the pI, you essentially average the most contributing pKa values.

anonymous · Answer

yes I know that, but how do u determine the most contributing when u only are given the structure of the amino acid at ph 7 and the various pka values?

aaronq · Answer

take the closest ones