作者jiti ()
看板Chemistry
标题Re: [问题]古典分析的问题
时间Fri Jan 18 11:27:36 2008
以下是我的想法 如有不对 请高手提出~
箭头都是双箭头 不过我不会弄>_<
CaF2(s) → Ca2+(aq) + 2F-(aq) Ksp =[Ca2+][F-]2
a 2a-b+c
H+(aq) + F-(aq) → HF(aq) Ka = [H+][F-]/[HF]
10^(-3)-b+c+d 2a-b+c b-c
H2O → H+ + OH- 10^(-14)=[H+][OH-]
10^(-3)-b+c+d d
所以mass balance equation
2[Ca2+] = [F-]+[HF]
solubility
s = a =[Ca2+] =1/2([F-]+[HF])
※ 引述《marucochiang (小桦)》之铭言:
: For a saturated solution of CaF2 buffered at pH 3.0,
: answer the following questions.
: ( Ksp = 3.2*10^(-11) for CaF2; Ka = 6.8*10^(-4) for HF )
: (a) Write the pertinent equilibrium constant expressions for the solution.
: (b) Write the mass balance equation.
: (c) Find the solubility of CaF2 in the solution.
: 我自己想了很久,还是解不出来,请各位高手帮帮忙<(_ _)>
: 关於(b) 我觉得应该是 C(下标CaF2)= [CaF2] + [CaF+] + [Ca2+]
: 不知道这样写对不对 > <
: 感谢大家!!!
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※ 编辑: jiti 来自: 140.122.142.177 (01/18 11:28)
1F:推 marucochiang:谢谢你的回答唷,不过有点怪怪的 01/19 20:54