) . H O Cr CrO :
Cr + 4OH = [Cr (OH) ]
2[Cr (OH) ] + 3H O + 2OH = 2CrO + 8 H O
[Cr (OH) ] + 4OH = CrO + 4H O + 3 ¯ H O + 2 = 2OH
. 3-4 (III) 8-10 NaOH , 3-4 5% . ? , . . )
) . , KMnO , (NH )S O . -
:
2r + 3S O + 7H O = Cr O + 6SO + 14H
2Cr + 2MnO + 5H O = 2 MnO(OH) ↓+ Cr O + 6H
Ag .
. 5-6 1 2N H SO AgNO . 2-3 (III). CrCl , Cl Cl . . . .). Cr , - , - .
) (H Cr O ).
H O , - :
Cr O + 4H O + 2H = 2H CrO + 3H O
, Cr . ( , ).
. , 2N . CrO - Cr O . .