H2S+ H2O Na2S2O3 - :
2Bi3+ + 3H2S = Bi2S3 ↓+ 6H+,
2Bi3+ + 3S2O32- + 3H2O = Bi2S3 ↓+ 6H+ + 3SO42-
. Bi(NO3)3 2 H2SO4 Na2S2O3. , . .
Sb3+
2 , +3 +5. .
.
:
Sb3+ + H2O + Cl¯ = SbOCl↓ + 2H+
, , .
. (III) 2-3 . . . . HCl . .
- .
H2S H2S+ H2O Sb(III), Sb(V) :
2Sb3++ 3 H2S= Sb2S3 ↓+ 6H+
2Sb5+ + 5 H2S= Sb2S5 ↓+ 10 H+
Na2S NaOH .
. 5-7 SbCl3 H2S. .
- .
Na2S2O3 Sb3+ Sb2OS2 ( ):
2Sb3++2 S 2O32- + 3 H2O= Sb2OS2 ↓+ 2 SO42- +6H+
Bi3+ , Sb2OS2. Cu2+, Hg2+ , , , SO2 S, .
. 3-4 SbCl3 H2SO4 1-2 Na2S2O3. . ?
- Zn, Al, Fe.
Sb3+ :
3Zn + 2[SbCl6]3- = 2Sb + 3Zn2+ + 12Cl-
. , . 2-3 .
- .
KNO2 NaNO2 [SbCl6]3- [SbCl6]¯. , , [B]+ [SbCl6]-, , . Sb(V) - .
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Sn2+, Fe3+, Zn2+, Cu2+ , Sb>1000 .
. 1-2 , KNO2, 1-2 0,2% 0,5 . , ?