Question

Which of the following solutions would have the highest pH? Assume that they are all 0.10 M in acid at 25∘C. The acid is followed by its Ka 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
Answer: B