TD Réactions de Complexation: Chimie CPGE

F e3+
βilogβ1β2β3
β4
[MLn]q
βj
Kfi logβjpKdii j
i≤j
pKdiKdi
pH =pKA+log [A−]
[AH]
F−
(2F3+,3SO2−
4)
(Na+, F −)
F−10−2L−1
pNH3=−log[NH3]
Co3+
pNH3

pNH3NH310−4mol.L−1
Kf1([Mn(Ox)]+) = 1010 Kf2([Mn(Ox)2]−=
106,6Kf3([Mn(Ox)3]3−) = 102,8
[Mn3+]i= 0,1mol.L−1[Ox2−]i= 0,1mol.L−1
[Mn3+]i= 0,1mol.L−1[Ox2−]i= 0,15mol.L−1
[F e(SCN )]2+
F e3+ SCN −F e(SCN )2+ logβ1= 2.1
[F e3+]0= 10−2mol.L−1
[SCN ]0=C
[F e(SCN )]2+ = 10−5,5mol.L−1
[Al(Ox)3]3−
Al3+ −OOC −COO−Ox2−[Al(Ox)3]3−
logβ3= 13 Ox2−
pOx =−log[Ox2−]
Ag+SCN−
pKd1([AgSCN]) = 7,6pKd2([Ag(SCN)2]−)=1,5
10
Ag+N H3
kf1([AgN H3]+) = 103,3Kf2([Ag(N H3)2]+) = 103,9
NH3
Cu2+ +nN H3= [Cu(N H3)n]2+
[Cu(N H3)]2+ [Cu(N H3)2]2+ [Cu(N H3)3]2+ [Cu(N H3)4]2+
n
logβn

βn
Kdn βn
pKdn =−log(Kdn)
pNH3
V0= 20mL C0=
1mol.L−1V1= 20mL C1= 0,01mol.L1
[Cu(N H3)4]2+
[NH3] [Cu(N H3)2+
4] [Cu2+]
Cl−Hg2+ HgCl2logβ2=
13,2
V0= 20,0mL c0= 5.10−2mol.L−1
V c1= 5.10−2mol.L−1
Ve
(Co2+)C2O2−
4[Co(C2O4)3]4−
β3= 1019,2
(en) [Co(en)3]2+ β0
3= 1013,2
β3β0
3
V= 100mL [Co(en)3]2+ C= 2.10−2mol.L−1
n= 10−2mol Na2C2O4
S2O2−
3Ag+[Ag(S2O3)2]2−
β2= 1013,5S2O3)2]2−Hg2+
beta0
2= 1029
V1= 20,0mL C1= 2.10−2mol.L−1V2= 30,0mL
C2= 5.10−2mol.L−1
V3=
50mL C3= 4.10−2mol.L−1

EDT A Y 4−
Ba2+ Ca2+
Ca2+ Ba2+ CaY 2−BaY 2−=−logY 4−
CaY 2−BaY 2−
pY = 7 pY = 10
EDT A Ba2+ Ca2+
Ca2+ Ba2+
Y4−