I would really appreciate some help on this chemistry question, thank you!

Question

The Kb of a weak base is 1.0 x 10-6. Which of the following is true about its conjugate acid?

(A) Ka = 1.0 x 10-20, the conjugate acid is stronger than the weak base.

(B) Ka = 1.0 x 10-8, the conjugate acid is weaker than the weak base.

(C) Ka = 1.0 x 10-20, the conjugate acid is weaker than the weak base.

(D) Ka = 1.0 x 10-8, the conjugate acid is stronger than the weak base.

Answer 1

Recall that Kw = KaKb

Kw = ionization of water = 1x10^-14

Ka = Kw/Kb = 1x10^-14 / 1x10^-6

Ka = 1x10^-8 which is less than (weaker than) 1x10^-6