Chemistry and Chemical Reactivity (9th Edition)

$K_a = 6.667\times 10^{- 6}$
1. We can use this formula to find the ka or kb of a conjugate acid-base pair. $K_b * K_a = K_w = 10^{-14}$ $1.5\times 10^{- 9} * K_a = 10^{-14}$ $K_a = \frac{10^{-14}}{ 1.5\times 10^{- 9}}$ $K_a = 6.667\times 10^{- 6}$