calculate the ph of 28.4 mM formic acid hcooh solution at 348K
K a =0,00018100 mol/l at hte same temprature
......................HCOOH ==> H^+ + HCOO^-
I......................28.4 mM........0...........0
C......................-x..................x............x
E....................28.4 -x.............x............x
Ka = 1.81E-4 = (x)(x)/(0.0284M-x)
Solve for x = (H^+) and convert to pH. Post your work if you get stuck.