The value of Ka for acetylsalicylic acid aspirin is 300104 W

The value of Ka for acetylsalicylic acid (aspirin) is 3.00×10-4. What is the value of Kb, for its conjugate base, C9H7O4-?

Solution

by definition

Ka x Kb = Kw = 1 x 10-14

Ka x Kb = 1 x 10-14

now

given Ka = 3 x 10-4

so

3 x 10-4 x Kb = 1 x 10-14

Kb = 3.333 x 10-11

so

the value of Kb is 3.333 x 10-11