3AS U01 - E5 - Exercice 026
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Transcript of 3AS U01 - E5 - Exercice 026
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3AS U01- Exercice 010
:(***)
HCOOC2H5 )Na+ + HO
- (
G .
V C = 10-2mol.L-1
t = 0 G0 ) .)t = 0
VS= V = 200 mL)
(
:
tf4515129630t (min)1.051.201.681.751.841.972.16G0G(mS)
x(mmol)
:HCOOC2H5+ HO
-= HCOO
-+ C2H5OH
:
:K = 1 cm :(Na+) = 5.01 ms.m2.mol-1
(HO-) = 19.9 ms.m2.mol-1
(HCOO-) = 5.46 ms.m2.mol-1
1-n0 t = 0
t = 0 t = 0 .V
-
t = 0 :)(OH+)(Na(V
Kn=G
-+0
0
-
G0.2-
.3-
)
(
.
-
G
t
:
-
:G = ax + bab . b.
-
a
-
G = f(x).
-
ab.
4-
x
. 5-
x = f(t).
)x.)(HCOO+)x-(n.)(OH+n).(Na(V
K=G
-0
-0
+
: .
:01/09/2014
: .
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Sujet : 2AS 02 - 01
1--
:))(HO+)(Na(V
Kn=G
-+00:
[ ] [ ])HO)(HO+Na)(NaK(=K=G --++00 )C)(HO+C)(NaK(=G -+0
))(HO+)(NaKC(=G -+0
))(HO+)(Na(V
Kn=G-+0
0
-
0G:
C = 10-2
mol/L = 10 mol/m3=
V
n0
s10.2.49=)10.19.9+10.5.01(10.10=G 3-3-3-2-0
2--
:
HCOOC2H5 + HO- = HCOO-+ C2H5OH
00n0n0x = 0xxn0- xn0- xxxfxfn0 xfn0 xfxf
3--
)x)(HCOO+x)-)(n(OH+)n(Na(V
K=G
-0
-0
+:
:HCOO-HO-Na+
:[ ] [ ] [ ])HCOO)(HCOO+OH)(OH+Na)(Na(K=K=G ----++
:
)V
x)(HCOO+
V
xn)(HO+
V
n)(Na(K=G -0-0+
)x)(HCOO+x)-(n)(HO+n)(Na(K=V
K=G
-0
-0
+
-
b+ax=G:
:
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: :
)x)(HCOO+x)(HO-n)(OH+n)(Na(V
K=G
--0
-0
+
)n))(HO+)(Na(+x))(OH-)(HCOO((V
K=G 0
-+--
))(HO+)(Na(V
Kn+x))(OH-)(HCOO(VK=G -+0--
:G = ax + b
:
))(HO-)(HCOO(V
K=a
-- , ))(HO+)(Na(
V
Kn=b
-+0
b t = 0)b = G0. (
-
a:
a )))(HO-)(HCOO :)(HO
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G = - 0.722 x + 2.49 . 10-3
0.722 x = 2.49 . 10-3
- G
0.722
G-10.2.49=x
3-
:
tf4515129630t (min)1.051.201.681.751.841.972.16G0G(mS)2.001.781.121.000.900.720.460x(mmol)
5-
)t(f=x:
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0 10 20 30 40 50
t (min)
x(mol) )L/mmom(x
(min)t
