% dissociation = (x*100)/c
0.47= x*100/7.95
x = 3.737*10^-2
HCOOH dissociates as:
HCOOH -----> H+ + HCOO-
7.95 0 0
7.95-x x x
Ka = [H+][HCOO-]/[HCOOH]
Ka = x*x/(c-x)
Ka = 3.737*10^-2*3.737*10^-2/(7.95-3.737*10^-2)
Ka = 1.8*10^-4
Answer: option 1
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