Make up the ionic equations for the reactions of formic acid: a) with zinc b) with sodium hydroxide

Make up the ionic equations for the reactions of formic acid: a) with zinc b) with sodium hydroxide c) with sodium carbonate, by what signs can one judge the origin of the reaction in each case?

a) Zn + 2HCOOH = Zn (HCOO) 2 + H2

Zn + 2H + + 2HCOO- = Zn2 + + 2HCOO- + H2

Zn + 2H + = Zn2 + + H2

The progress of the reaction can be judged by the dissolution of the metal and the release of hydrogen bubbles.

b) HCOOH + NaOH = HCOONa + H2O

H + + HCOO- + Na + + OH- = HCOO- + Na + + H2O

H + + OH- = H2O

The progress of the reaction can be judged by the change in the color of the indicator.

c) 2HCOOH + Na2CO3 = 2 HCOONa + H2O + CO2

2HCOO- + 2H + + 2Na + + CO3 2- = 2HCOO- + 2Na + + H2O + CO2

2H + + CO3 2- = H2O + CO2

The progress of the reaction can be judged by the release of bubbles of carbon dioxide.

For all reactions, formic acid is of medium strength, therefore it dissociates in solution.