Exhibit 15-5 Consider Solving for the PH of a 0

Exhibit 15-5 Consider solving for the pH of a 0.300 M aqueous solution of KCN to answer the following question(s) .
-Refer to Exhibit 15-5. What is the base ionization constant, K _b, of CN ^- if the acid ionization constant, K _a, of HCN is 6.2×10 ^{- 10}?

A) K _b = 6.2×10 ^{- 24}
B) K _b = 1.9×10 ^{- 10}
C) K _b = 1.6×10 ^{- 5}
D) K _b = 9.21
E) K _b = 6.2×10⁴