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HNOdwa + KOH = KNOdwa + HdwaO
kwas + metal= sól + wodór
2HNOdwa + 2K = 2KNOdwa + Hdwa
kwas + tlenek metalu = sól + woda
2HNOdwa + KdwaO = 2KNOdwa + HdwaO
2) K2O + 2HNO2 -> 2KNO2 + H2O
3) KOH + HNO2 -> KNO2 + H2O