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pKa Calculator — Free Online Tool
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pKa Calculator

Calculate pKa from Ka or convert pKa to acid dissociation constant

Formula: pKa = −log10(Ka)  |  Ka = 10−pKa
Lower pKa values indicate stronger acids that dissociate more completely in water.
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⚠️ Acid dissociation constants (Ka and pKa) are temperature-dependent. Changes in thermal energy alter equilibrium positions, meaning tabulated pKa values typically apply strictly at standard conditions (25 °C).

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