a) 2HCOOH+2Na--->2HCOONa+H2
HCOOH+NaOH--->HCOONa+H2O
2HCOOH+Na2O--->2HCOONa+H2O
b) 2CH3COOH+Ca--->(CH3COO)2Ca+H2
2CH3COOH+Ca(OH)2--->(CH3COO)2Ca+2H2O
2CH3COOH+CaO--->(CH3COO)2Ca+H2O
c) 2C3H7COOH+2K--->2C3H7COOK+H2
C3H7COOH+KOH--->C3H7COOK+H2O
2C3H7COOH+K2O--->2C3H7COOK+H2O
d) 2C2H5COOH+2Li--->2C2H5COOLi+H2
C2H5COOH+LiOH--->C2H5COOLi+H2O
2C2H5COOH+Li2O--->2C2H5COOLi+H2O