The Ka–Kb Relationship for a Conjugate Pair
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For any conjugate pair, Ka times Kb equals Kw, so a stronger conjugate acid always pairs with a weaker conjugate base.
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Acetic acid's Ka near 10⁻⁵ and acetate's Kb near 10⁻¹⁰ multiply to about Kw, 10⁻¹⁴.
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A weak acid's conjugate base is not automatically strong; only a true conjugate pair's Ka and Kb multiply to Kw.