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H2SO4 +2NaOH ---> Na2SO4+H2O
2. kwas +tlenek metalu --->sól+woda
H2SO4+ Na2O --> Na2SO4 +H2O
3. kwas +metal --->sól+wodór
H2SO4+ 2Na ---> Na2SO4 +H2
4. tlenek kwasowy+zasada ---> sól+woda
SO3+2NaOH ---> Na2SO4 +H2O
5.tlenek kwasowy+tlenek metalu ---> sól
SO3 +Na2O --->Na2SO4