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H2S + Fe(OH)2 -> FeS + 2H2O
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H2SO3 + Ba(OH)2 -> BaSO3 + 2H2O
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H2CO3 + Mg(OH)2 -> MgCO3 + 2H2O
2. metal+kwas->sol+wodór
Fe + H2S -> FeS + H2(strzałka w gore)
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Ba + H2SO3 -> BaSO3 + H2(strzałka w góre)
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Mg + H2CO3 -> MgCO3 + H2(strzałka w górę)
3. tlenek metalu + kwas -> sol + woda
FeO + H2S -> FeS + H2O
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BaO + H2SO3 -> BaSO3 + H2O
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MgO + H2CO3 -> MgCO3 + H2O