The concentration of formate ion (HCOO⁻) present in 0.1 M formic acid (HCOOH) solution at equilibrium is :
(Ka=1.6×10⁻⁴)
A 4×10⁻³ M
B 3×10⁻⁶ M
C 1.5×10⁻³ M
D 5×10⁻⁶ M