CORRECTED:
Methanoic acid, also known as formic acid, is HCOOH. Its conjugate base is HCOO-.
The equilibrium equation is
HCOOH (aq) <--> HCOO- (aq) + H+ (aq)
The acid dissociation expression takes the form
Ka = [HCOO-][H+]
----------------
[HCOOH]
where[...] means concentration of ...
Hope this helps; Good luck with your studies!
J.R. S.
05/12/19