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PKA value and net charge(due tomorrow please help)

scilearner
in Chemistry

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1.Determine the net charge of the following peptide at PH 7.0

 

PKa values

C00H NH3+ Side chain

 

Valine 2.29 9.72

 

Aspartate 1.99 10.0 3.96

 

 

2. The PKa value of the sulphydryl (-SH) group of cysteine is 8.33. Calculate the fraction of anion to free sulfhydryl group at PH 7.O.

 

I'm not a homework posting type person. But today I'm really running out of time and really need help. Hope you understand and help. Thank you so much :)

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