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[H⁺] = Kₐ.([HCOOH] / [HCOONa])
10⁻⁴ / 1,8.10⁻⁴ = [HCOOH] / [HCOONa]
0,55 = 0,05 / [HCOONa]
[HCOONa] = 0,09 M
SOLVED!