Which of the following solutions would have the most basic pH? Assume that they are all 0.10 M in acid at 25^∘C.The acid is followed by its K_a value. A)HF,3.5 × 10^-4 B)HCN,4.9 × 10^-10 C)HNO₂,4.6 × 10^-4 D)HCHO₂,1.8 × 10^-4 E)HClO₂,1.1 × 10^-2

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Quizplus · Accepted Answer

The lower the pKa value, the stronger the acid, and the weaker its conjugate base. HCN (hydrogen cyanide) has a pKa value of 9.2, which means it is a stronger acid than HF (hydrogen fluoride) with a pKa value of 3.2, HNO2 (nitrous acid) with a pKa value of 3.3, HCHO2 (formic acid) with a pKa value of 3.75, and HOCl (hypochlorous acid) with a pKa value of 7.5. Therefore, HCN will have the weakest conjugate base and the highest pH among the choices given.

Which of the Following Solutions Would Have the Most Basic