[學科] 普化問題

看板Chemistry作者 (^^)時間15年前 (2009/05/01 17:34), 編輯推噓1(1推 0噓 5→)
留言6則, 1人參與, 最新討論串1/8 (看更多)
小弟不才，想請問各位大大一題普化： 1. The compound MX has a Ksp value of 1 x 10-20. The anion X? forms the weak acid HX. The observed solubility of MX in 5.0 M strong acid is 5.00 x 10-3 M. Calculate the Ka value for HX. 個人覺得想當有深度和難度，希望有高手解惑！ 也請將解題思路清楚說明，小弟我感激不盡。 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.123.78.220
推
05/01 18:13, , 1F
From the solubility given we know that
05/01 18:13, 1F
→
05/01 18:14, , 2F
in the 5.0 M strong acid solution,[M+]=[HX]=5.00x10-3
05/01 18:14, 2F
→
05/01 18:17, , 3F
Ka=[X-][H+]/[HX]=Kspx[H+]/[M+][HX]=2x10-15
05/01 18:17, 3F
→
05/01 18:18, , 4F
Is that right?
05/01 18:18, 4F
→
05/01 18:58, , 5F
p.s [M+]=[X-]+[HX], but HX is a weak acid,which means
05/01 18:58, 5F
→
05/01 18:59, , 6F
that [X-] is almost zero. So [M+]=[HX]
05/01 18:59, 6F
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文章代碼(AID): #19-i8LsQ (Chemistry)
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文章代碼(AID): #19-i8LsQ (Chemistry)