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王涛0715

金虫 (正式写手)

[求助] 有一个分析化学上的题,求大家帮忙求解下

有一个分析化学上的题,求大家帮忙求解下

Calculate the molar solubility of Nickel (II) Iodate in 3.0M NH3.?
Calculate the molar solubility of Nickel (II) Iodate in 3.0M NH3.
Ksp of Ni(IO3)2 = 2.7x10^-3 and Kf of Ni(NH3)6 (3+) = 2.0x10^8

The answer is 0.49M I just have no idea how to solve. For other problems I've combined the equations and multiplied Ksp with Kf to get an overall K value. Still have trouble getting 0.49M tho. Anyone help?
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jiagle

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【答案】应助回帖

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感谢参与,应助指数 +1
王涛0715: 金币+15, ★★★★★最佳答案 2013-03-05 09:00:10
fds329: 金币+3, ICEPI+1, 感谢应助。辛苦了O(∩_∩)O 2013-03-11 11:54:59
Ni(IO3)2(s) + 6NH3 = [Ni(NH3)6](2+) + 2IO3(-)
                       3.0           0                    0
                       3.0-6x       x                    2x
       x*(2x)^2 / (3.0 - 6x)^6 = Kf * Ksp
Nowton Iteration  (x< 3.0/6 =0.5)
       x = 0.4838 ~= 0.48mol/L
3楼2013-03-05 08:29:02
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caominone

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【答案】应助回帖

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感谢参与,应助指数 +1
王涛0715: 金币+5, ★有帮助 2013-03-05 09:00:02
fds329: 金币+2, 感谢应助。辛苦了O(∩_∩)O 2013-03-11 11:54:48
your idea is wrong,you should use kf divide ks,write the balance equation,

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锅可以背,但不能不明不白
2楼2013-03-04 23:57:23
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