Apentix/AP Chemistry/Unit 8: Acids and Bases/Question

AP Chemistryeasymcq1 pt

Which mixture does NOT produce a buffer solution?

A.NH₄Cl mixed with NH₃ in comparable moles

B.HF mixed with NaF in comparable moles

C.CH₃COOH mixed with half as many moles of NaOH

D.CH₃COOH mixed with an equal number of moles of NaOH

Explanation

Core Concept

A buffer needs appreciable amounts of both members of a conjugate pair. Equal moles of NaOH and acetic acid react completely, converting every HA into A⁻ and leaving acetate alone with no acid partner. Each other mixture ends with both members of a conjugate pair coexisting, which is the buffer condition.

Correct Answer

DCH₃COOH mixed with an equal number of moles of NaOH

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