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2H+ +2NO3- +Ca2+ +2OH- --->Ca2+ +2NO3- +2H2O
2H+ +2OH- --->2H2O
b)6HNO3+Fe2O3--->2Fe(NO3)3+3H2O
6H+ +6NO3- +Fe2O3--->2Fe3+ +6NO3- +3H2O
6H+ +Fe2O3 --->2Fe3+ +3H2O
Ca²⁺+2OH⁻+2H⁺+2NO₃⁻--->Ca²⁺+2NO₃⁻+2H₂O
2H⁺+2OH⁻--->2H₂O
b)Tlenki żelaza są dwa: FeO i Fe₂O₃
FeO+2HNO₃--->Fe(NO₃)₂+H₂O
FeO+2H⁺+2NO³⁻--->Fe²⁺+2NO₃⁻+H₂O
FeO+2H⁺--->Fe²⁺+H₂O
Fe₂O₃+6HNO₃--->2Fe(NO₃)₃+3H₂O
Fe₂O₃+6H⁺+6NO₃⁻--->2Fe³⁺+6NO₃⁻+3H₂O
Fe₂O₃+6H⁺--->2Fe₃⁺+3H₂O