烂番茄19个
花朵
共回答了12个问题采纳率:91.7% 举报
答:
【1】突越范围 pH = 6.74 - 9.7 的计算:
1、计量点前(19,98 ml):pH = pKa + lg[(19.98/0.02)] = 3.74+3 = 6.74
2、计量点前(20,02 ml):pH = 14 - pOH = 14- (20.02-20.00/40.02)
=14 - 4.3 = 9.70
【2】化学计量点时pH = 8.22的计算:
pH =14 -pOH = 14 - p(CKa)^0.5p = 14 - p[(0.05x5.6x10^-11)^0.5] = 14 - 5.78 = 8.22
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