Answer
a. $$K_ a = 6.7 \times 10^{-6} $$
b.$$K_ b = 5.6 \times 10^{-11} $$
c. $$K_ b = 1.0 \times 10^{-4} $$
Work Step by Step
We find:
a. $$K_ a = \frac{10^{-14}}{ 1.5 \times 10^{-9} } = 6.7 \times 10^{-6} $$
b.$$K_ b = \frac{10^{-14}}{ 1.8 \times 10^{-4} } = 5.6 \times 10^{-11} $$
c. $$K_ b = \frac{10^{-14}}{ 1.0 \times 10^{-10} } = 1.0 \times 10^{-4} $$