Formic acid is only readily soluble in water and in both 0.6 M NaHCO3 and 2.5 M NaOH.

Question

give a brief explanation of the reaction for each

Answer 1

Same answer as above for hexanoic acid.

Answer 2

These are typical reactions between and acid and a bicarbonate, and an acid and a base. Sodium formate (a salt) and H2O are forming in both cases. CO2 is forming typically when a base reacts with a bicarbonate or a carbonate.

HCOOH + NaHCO3 ---> HCOONa + H2O + CO2

HCOOH + NaOH ---> HCOONa + H2O