2HCOOH + Ca(OH)2 = (HCOO)2Ca + 2H2O CH3COOH+KOH=CH3COOK+H2O 2HCOOH + K2CO3 = 2HCOOK + CO2 + H2O 2CH3COOH+ MgO=(CH3COO)2Mg+H2O HCOOH + CH3OH → HCOOCH3 + H2O