. , MnO-4
H+ Mn+2
MnO-4 H2O MnO2
-
OH- MnO42-
. .
1) 2 KMn+7O4 + 5Na2S+4O3 + 3H2SO4 = 2Mn+2SO4 + 5Na2SO4 + K2SO4+3H2O
Mn+7 + 5e = Mn+2 2 KMnO4= \5=158\5=31,6 \
S+4 -- 2e = S+6 5
( )
5Na+NO2 + 2KMnO4 + 3H2SO4 = 5NaNO3 + 2MnSO4 + 3H2O + K2SO4
MnO-4 + 8H+ + 5e = Mn+2 + 4H2O 2
NO-2 + H2O - 2e = NO-3 + 2H+ 5
2MnO-4 + 16H+ + 5NO-2 + 5H2O = 2Mn+2 + 8H2O + 5 NO-3 + 10H+
6H+ 3H2O
( )
2) KMn+7O4 + 3Na2SO3 + H2O = 2 Mn+4O2 ↓ + 3 Na2SO4 + 2KOH
Mn+7 + 3e = Mn +4 2
KMnO4 = M\3 = 158\3 = 52,7 \
S+4 - 2e = S+6 3
3) 2 KMn+7O4 + Na2SO3 + 2KOH = 2K2Mn+6O4 + Na2SO4 + H2O
Mn+7 + 2e = Mn+6 2 KMnO4 = M\1 = 158\1 = 158,0\
S+4 -2e = S+6 1
, .
( ) , , - , .
, /
= M / n
, , .
.
, .
( ) , , - , .
, /
= M / n
, , .
. , . . .
, , , , , , .
|
|
().
Me ↔ Me2+ + 2e
Me2+ + m H2O ↔ Me2+ · m H2O
Me + m H2O ↔ Me2+ · m H2O +2e
Me+2, , , , (), - .
- .
, , .
.. (1888).
EMe = E0Me + (R ∙T/n F) / ln Men+,
Me = E0Me + (R∙T/n F) / ln [Men+ ],
EMe = E0Me + 0,0592/n ·lg [Men+]