. , . .
, 䳺 , . , , .
Na+, K+, NH4+, Mg2+. . , .
Ba2+, Sr2+, Ca2+. (NH4)2CO3 (NH3H2+NH4Cl). 䳿 .
(BaCO3)=4,01010; (SrCO3)=1,11010; (CaCO3)=3,8109.
, . ó , :
MeS + 2HOH Me(OH)2 + H2S.
ó , Ba(OH)2, .
Al3+, Cr3+, Fe3+, Fe2+, Ni2+, Co2+, Mn2+, Zn2+ .
(NH4)2S. (=7-9) 䳿 :
(Al(OH)3)=3,21034 | (Fe2S3)≈11088 |
(Cr(OH)3)=6,31031 | (FeS)=5,01018 |
(Fe(OH)3)=6,31038 | (NiS)=3,21019 |
(Fe(OH)2)=7,21016 | (β-CoS)=1,91027 |
(Ni(OH)2)=2,01015 | (MnS)=2,51010 |
(Co(OH)2)=4,01045 | (ZnS)=1,61024 |
(Mn(OH)2)=1,91013 | |
(Zn(OH)2)=1,41017 |
ó Fe(OH)3, Fe(OH)2, Ni(OH)2, Co(OH)2, Mn(OH)2, Zn(OH)2 , , , , ͳ, , , .
.
Cu2+, Cd2+, Hg2+, Bi3+, As3+, AsV, SbV, Sb3+, Sn2+, SnIV . H2S . =0,5 䳿 :
(CuS)=6,31036; (CdS)=1,61028; (HgS)=1,61052; (Bi2S3)=1,0109; (SnS)=2,51027.
CuS, CdS, Bi2S3, HgS (NH4)2Sx. As2S3, Sb2S3, SnS .
|
|
ҳ , .
:
SnS2 + Na2S Na2SnS3;
Sb2S3 + 3Na2S 2Na3SbS3.
ҳ , , , , .
Ag+, Hg22+, Pb2+ . 2/3. 䳿 :
(AgCl)=1,781010; (Hg2Cl2)=1,331018; (PbCl2)=1,6105.
(()=2/3) .
䳺 . .
ϳ , =7-9. , .
. ((NH4)2S) , . . , .
. , . :
, ;
;
, ;
( 25-30 );
, .