The strength of an acid is inversely related to the strength of its conjugate base.
• Strong acids dissociate completely, producing stable conjugate bases with little tendency to accept a proton. Therefore statement (A) is correct, that is, the stronger the acid, the weaker is the conjugate base.
• pKa value: is the indicator of acid strength; the larger the pKa value, the weaker the acid.
Therefore a higher pKa indicates a weaker acid, which leads to a stronger conjugate base and statement (D) is correct, that is, the larger the pKa value of the conjugate acid, the stronger its base. Statements B and C are incorrect.
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