Odpowiedź :
a) Sn(OH)2+2HCl--->SnCl2+2H2O
Sn(OH)2 +2H+ +2Cl- --->Sn2+ +2Cl- +2H2O
Sn(OH)2 +2H+ --->Sn2+ +2H2O
Sn+2HCl--->SnCl2+H2
Sn +2H+ +2Cl- --->Sn2+ +2Cl- +H2
Sn +2H+ --->Sn2+ +H2
SnO+2HCl--->SnCl2+H2O
Sn+Cl2--->SnCl2
b) Sr(OH)2+H2S--->SrS+2H2O
Sr2+ +2OH- +2H+ +S2- --->Sn2+ +S2- +2H2O
2OH- +2H+ --->2H2O
Sr+H2S--->SrS+H2
Sr +2H+ +S2- --->Sr2+ +S2- +H2
Sr +2H+ --->Sr2+ +H2
SrO+H2S--->SrS+H2O
Sr+S--->SrS
c) 2NH3*H2O+H2S--->(NH4)2S+2H2O
2NH4+ +2OH- +2H+ +S2- --->2NH4+ +S2- +2H2O
2OH- +2H+ --->2H2O
NH3+H2S--->(NH4)2S
(NH4)2CO3+H2S--->(NH4)2S+H2O+CO2
2NH4+ +CO3 2- +2H+ +S2- --->2NH4+ +S2- +H2O+CO2
CO3 2- +2H+ --->H2O+CO2
Al2S3+6NH3*H2O--->3(NH4)2S+2Al(OH)3↓
2Al3+ +3S2- +6NH4+ +6OH- --->6NH4+ +3S2- +2Al(OH)3
2Al3+ +6OH- --->2Al(OH)3↓