A.01:0C:CD:04:00:00-01:0C:CD:04:01:FF
B.01:0C:CD:04:00:00-01:0C:CD:04:02:FF
C.01:0C:CD:01:00:00-01:0C:CD:01:01:FF
D.01:0C:CD:01:00:00-01:0C:CD:01:02:FF
A.01:0C:CD:04:00:00-01:0C:CD:04:01:FF
B.01:0C:CD:04:00:00-01:0C:CD:04:02:FF
C.01:0C:CD:01:00:00-01:0C:CD:01:01:FF
D.01:0C:CD:01:00:00-01:0C:CD:01:02:FF
酸,加入32.80mLNaOH溶液时到达终点.当加入16.40mLNaOH溶液时,pH为4.20.根据上述数据求:(1)酸的pKa;(2)酸的相对分子质量;(3)如酸只含C、H、O,写出符合逻辑的经验式(本题中C二12、H二1、O二16).