Ka ↔ Kb Converter — Ka·Kb = Kw

Every conjugate acid–base pair shares one fixed product: K_a × K_b = K_w. Know how strong the acid is, and you immediately know how strong its conjugate base is — and vice versa.

How to interpret the result

Worked check: acetic acid K_a = 1.8×10⁻⁵ → its conjugate base acetate has K_b = 10⁻¹⁴/1.8×10⁻⁵ = 5.6×10⁻¹⁰. Strong acid ⟺ weak conjugate base, always.

Assumptions

• Aqueous solution at 25 °C (K_w = 1.0×10⁻¹⁴)
• K_a and K_b belong to a true conjugate pair