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Mg2+ + 2OH- + 2H+ + 2NO3- ->Mg2+ + 2NO3- + 2H2O
2OH- + 2H+ -> 2H2O/:2
OH- + H+ ->H2O
b)Ca(OH)2+2HCl->CaCl2+2H2O
Ca2+ + 2OH- + 2H+ + 2Cl- ->Ca2+ + 2Cl- + 2H2O
2OH- + 2H+ -> 2H2O/:2
OH- + H+ -> H2O
c)2NaOH+H2S->Na2S+2H2O
2Na+ + 2OH- + H+ + S2- ->2Na+ + S2- + H2O
2OH- + 2H+ ->2H2O
OH- + H+ ->H2O