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2Al3+ +6OH- +6H+ +3CO3 2- --->2Al3+ +3CO3 2- +6H2O
6OH- +6H+ --->6H2O
2NaOH+H2S--->Na2S+2H2O
2Na+ +2OH- +2H+ +S2- --->2Na+ +S2- +2H2O
2OH- +2H+ --->2H2O
Zn(OH)2+2HNO3--->Zn(NO3)2+2H2O
Zn2+ +2OH- +2H+ +2NO3- --->Zn2+ +2NO3- +2H2O
2OH- +2H+ --->2H2O
H₂S + 2NaOH ------> Na₂S + 2H₂O
2HNO₃ + Zn(OH)₂ -----> Zn(NO₃)₂ + 2H₂O