Cours - Documents de cours de C. Ursini

© C. Ursini
−→
`
C3H8O
Cu2+ HO−
C3H8O + 9
2O2−→ 3CO2+ 4H2O
Cu(HO)2Cu2+ + 2HO− −→ Cu(HO)2
x

© C. Ursini
n(X) X
x= 0 mol
c
V1V2
Cu2+ + HO− −→ Cu(OH)2
n(Cu2+) = c×V1n(HO−) = c×V2
Cu2+ + 2HO− →Cu(OH)2
0n(Cu2+)n(HO−) 0
x
x= 0
x
Cu2+
HO−x
xCu2+ 2xHO−
n(Cu2+)−xCu2+ n(HO−)−2x
HO−
Cu2+ + 2HO− →Cu(OH)2
0n(Cu2+)n(HO−) 0
x n (Cu2+)−x n (HO−)−2x x
x
x
x=x
Cu2+ + 2HO− →Cu(OH)2
0nH2i nO2i0
x n (Cu2+)−x n (HO−)−2x x
x n (Cu2+)−x n (HO−)−2x x
n(Cu2+)−x>0
n(HO−)−2x>0
x
H2+1
2O2−→ H2O 2 H2+ O2−→ 2 H2O

© C. Ursini
α+ne−+... =β+...
S2O32−/S
¬
=
®
¯H+
°
¬S2O32−= S
S2O32−=2 S
®S2O32−= 2 S + 3H2O
¯S2O32−+6 H+= 2 S + 3 H2O
°S2O3
2−+6H++4e−= 2 S + 3 H2O
1 1/1 2 2/2
1 2
20 mL Fe2+ +SO42−
20 mL
Na++ S2O32−
¬
®
¬Fe2+
S2O32−
S2O32−/S Fe3+/Fe2+
S2O32−+ 6 H++ 4 e−= 2 S + 3 H2O
Fe2+ = Fe3+ + e−
®
S2O32−+ 4Fe2+ + 6H+
→2 S + 4Fe3+ + 3H2O(`)