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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 . .

 

  1. .

H2S H2S+ H2O Sb(III), Sb(V) :

 

2Sb3++ 3 H2S= Sb2S3 ↓+ 6H+

2Sb5+ + 5 H2S= Sb2S5 ↓+ 10 H+

Na2S NaOH .

. 5-7 SbCl3 H2S. .

 

  1. .

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. . ?

  1. Zn, Al, Fe.

Sb3+ :

 

3Zn + 2[SbCl6]3- = 2Sb + 3Zn2+ + 12Cl-

. , . 2-3 .

  1. .

KNO2 NaNO2 [SbCl6]3- [SbCl6]¯. , , [B]+ [SbCl6]-, , . Sb(V) - .

 
 

 

 


Sn2+, Fe3+, Zn2+, Cu2+ , Sb>1000 .

. 1-2 , KNO2, 1-2 0,2% 0,5 . , ?





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