Arginine has a pKa of 12.48. At which pH will >50% of the R-groups in a solution of arginine be positively charged?
a. 13.58
b. 12.48
c. 11.09
d. Cannot be determined from the information given
a. 13.58
b. 12.48
c. 11.09
d. Cannot be determined from the information given