[化學] 電化學、Ksp計算
http://exam.lib.ntu.edu.tw/sites/default/files/exam/undergra/98/98021.pdf
第21題
Calculate the Ksp of Hg Cl , knowing the following standard reduction
2 2
potentials.
2+ - 。
Hg + 2e → Hg ε = 1.62 V
2+ - 2+ 。
2Hg + 2e → Hg ε = 0.92 V
2
- - 。
Hg Cl + 2e → 2Hg + 2Cl ε = 0.27 V
2 2
網路上查到的的氯化亞汞 Ksp = 4.13 x 10^(-18)
跟自己算的答案明顯差很多~"~
過程如下,請大家幫忙看看是哪裡出錯了<(_ _)>
計算過程:
總反應的電位 = 0.27 - 1.62 + 0.92 = -0.43
由涅斯特方程式得
-0.43 = [(8.314 x 298)/(2 x 96485)] x ln(Ksp)
最後算出來的答案是2.85 x 10^(-15) (差了好多囧)
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