The pka of an acid whose ka = 10–11 is
1011
11
–11
3
–3

Option (b) is the correct answer.

Explanation:

Relation between and is as follows.

where,   is the acid dissociation constant.

As value of is given as . Therefore, calculating teh value of as follows.

                                   = -log ()

                                   = - (-11 × log (10))

                                   = 11

Thus, we can conclude that the of an acid whose is 11.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)