1) 2HCOOH + Mg = (HCOO)₂Mg + H₂
2) 2CH₃-CH₂-COOH + CaO = (CH₃-CH₂-COO)₂Ca + H₂O
3) HCOOH + KOH = HCOOK + H₂O
4) 2HCOOH + K₂CO₃ = 2HCOOK + CO₂ + H₂O
5) CH₃-CH₂COOH + C₂H₅OH = CH₃-CH₂-CO-O-C₂H₅ + H₂O
в структурном виде:
O
//
CH₃-CH₂-C + CH₃-CH₂-OH ---->
\
OH
O
//
CH₃-CH₂-C + H₂O
\
O-CH₂-CH₃
6) HCOOH + Ag₂O = CO₂ + H₂O + 2Ag
оксид углерода(IV), вода, серебро