导——中和热
NaOH(aq)+HCl(aq)=NaCl(aq)+H2O(l) △H=-57.3KJ/mol KOH(aq)+HNO3(aq)=KNO3(aq)+H2O(l) △H=-57.3KJ/mol Ba(OH)2(aq)+2HCl(aq)=BaCl2(aq)+2H2O(l) △H=-114.6KJ/mol
H+ (aq)+OH- (aq) = H2O(l)
△H=-57.3KJ/mol