ĐÁNH GIÁ KHẢ NĂNG XÁC ĐỊNH HẰNG SỐ CÂN BẰNG CỦA CÁC AMINO AXIT VÀ AXIT TƯƠNG ĐỐI MẠNH TRONG DUNG DỊCH NƯỚC BẰNG PHƯƠNG PHÁP CHUẨN ĐỘ ĐIỆN THẾ
Từ khóa:
Dissociation constant; sulfuric acid, oxalic acid and glutamic acid; potentiometric titration
Tóm tắt
In this study, the dissociation constants of acids such as sulfuric acid (the second dissociation constant), oxalic acid and glutamic acid were determined, through individual potentiometric titration of each studied acid solution. However, the first calculated dissociation constant of oxalic acid differs with the literature value significantly. Moreover, the first dissociation constant of glutamic acid cannot
be determined. The result shows that it needs to add strong acid to the studied acid solution for determining acid dissociation constants of amino acids and ones stronger than 10–2 of acids (pKa < 2) by the potentiometric titration method.
