Odpowiedź :
Może chodziło o kwas metanianowy (mrówkowy)
KOH+HCOOH--->HCOOK+H2O
Ca+2HCOOH--->(HCOO)2Ca+H2
CaO+2HCOOH--->(HCOO)2Ca+H2O
Na2O+2HCOOH--->2HCOONa+H2O
KOH+CH3COOH--->CH3COOK+H2O
Ca+2CH3COOH--->(CH3COO)2Ca+H2
CaO+2CH3COOH--->(CH3COO)2Ca+H2O
Na2O+2CH3COOH--->2CH3COONa+H2O
KOH+C2H5COOH--->C2H5COOK+H2O
Ca+2C2H5COOH--->(C2H5COO)2Ca+H2
CaO+2C2H5COOH--->(C2H5COO)2Ca+H2O
Na2O+2C2H5COOH--->2C2H5COONa+H2O
KOH+C3H7COOH--->C3H7COOK+H2O
Ca+2C3H7COOH--->(C3H7COO)2Ca+H2
CaO+2C3H7COOH--->(C3H7COO)2Ca+H2O
Na2O+2C3H7COOH--->2C3H7COONa+H2O
KOH+C4H9COOH--->C4H9COOK+H2O
Ca+2C4H9COOH--->(C4H9COO)2Ca+H2
CaO+2C4H9COOH--->(C4H9COO)2Ca+H2O
Na2O+2C4H9COOH--->2C4H9COONa+H2O