Re: [高中] 平衡常數
※ 引述《pingshung (孤獨之狼)》之銘言:
: 初時[H2S]=1/10=0.1M
: H2S ==> H+ + HS- Ka1
: 0.1-x 10^-4 x-y
: HS- ==> H+ + S2- Ka2
: x-y 10^-4 y
: 設0.1>>x>>y
: [HS-]=Ka1*[H2S]/[H+]
: [S2-]=Ka1*Ka2*[H2S]/[H+]^2
: =1.65*10^-13 M
: [Mn2+][S2-]=6.0*10^-16
: [Mn2+]=3.63*10^-3M
: (3.63*10^-3)*2*55=0.40克
H2S ⇋ HS- + H+
0.1-x x x
ka1 = x^2/(0.1-x) ⇨ x= 1.045*10^-4
HS- ⇋ S2- + H+
x y x+y
ka2 = y(x+y)/x ⇨ y= 1.5*10^-13 = [S2-]
[Mn2+]=ksp/[S2-] ⇨ [Mn2+]=4*10^-3
(4*10^-3)*2*55 = 0.44g
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