問題詳情

1. Glutamic acid contains two carboxylic acid groups (pKa = 2.2 and 4.2) and an amine group (pKa =9.7). What is the pI for glutamic acid? What is glutamic acid's net charge in a solution with pH =7.4?
(A) 3.2, negative charge
(B) 6.0, negative charge
(C)6.5, no charge
(D) 7.0, positive charge
(E) none of the above

參考答案

答案：A
難度：計算中-1
書單：沒有書單，新增

用户評論

【一切有為法.如夢幻泡影】評論

（2.2+4.2）/2=3.3

【JC】評論

（2.2+4.2)/2=3.2pH>pI 分子帶負電negative charge