valor de Ka / constante de dissociação ácida
1. The acid dissociation constant; a quantitative measure of the strength of an acid in solution, representing the equilibrium constant for the dissociation of a weak acid into its conjugate base and hydrogen ions
The Ka value of acetic acid is approximately 1.8 × 10⁻⁵, indicating it is a weak acid.
O valor de Ka do ácido acético é aproximadamente 1,8 × 10⁻⁵, indicando que é um ácido fraco.
2. A numerical value used in chemistry to predict the degree of ionization of weak acids and to compare relative acid strengths
A lower Ka value means the acid is weaker and dissociates less in solution.
Um valor de Ka mais baixo significa que o ácido é mais fraco e se dissocia menos em solução.
This is a technical scientific term used universally in chemistry education across English-speaking and Portuguese-speaking countries. It is not subject to regional variation or slang usage, as it is part of standardized chemistry nomenclature taught in schools and universities.
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