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AP Chemistry/Unit 8: Acids and Bases
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Weak Acid Weak Base Equilibrium

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A solution is prepared by mixing equimolar amounts of methylamine (CH₃NH₂, Kb = 4.4 × 10⁻⁴) and hydrofluoric acid (HF, Ka = 7.2 × 10⁻⁴). Which of the following species has the highest concentration in the resulting solution at equilibrium?

A

F⁻

B

CH₃NH₃⁺

C

CH₃NH₂

D

HF

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