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@JoannaBlackwelder A or B?
What do you think? It's only one answer.
When an acid is deprotonated or dontates a proton, that is \(\sf -H^+ \) the remainder is called conjugate base. Typically, a strong acid's conjugate base is relatively stable, which means it is a weak one. Now, the same kind of concept applies in terms of conjugate acid.
D is correct becouse the conjugate acid comes from base .with base you will use Kb not Ka
I don't think the answer is d... Remember this that the Kw=(Ka)(Kb) given the known Ka of the conjugate weak acid we can take it and find the Kb of the strong conjugate base like this Kw/Ka=Kb
You are correct , but there is nothing mensioned bout Kb, in this question, of strong base .it just mensioned kb of weak base
Yeah kW = Ka x Kb I always get mixed up with the terminology.. "The Ka of a conjugate acid is known" If you know Ka you can get Kb that's for sure. If it's a strong base high Kb it will want that proton badly, I think it would produce a weak conjugate acid w Low Ka. I guess we don't know whether the base was strong of weak to begin with..
Ok so why isn't it D?
from my understanding whether you are given a \(\sf K_a~or~K_b \) it provides you the information of the other. The a and b are just an assignment for acid and base specifically. An acid's relative strength or weakness provide an information about it's conjugate base. Similarly, a conjugate acid will provide you the relative strength strength or weakness of the base. I think this problem is more about the terminology rather than the qualitative (strong or weak) or quantitative aspect of acid-base. So, if we have to choose from the options provided only considering the assignment of an "a" and "b", then we are looking for a description of base, and the best that will fit is base with a measurement of "b." I would like to read other reasoning if what I provided isn't good to answer the problem.
That is to say that I agree with photon dude
If you have NH3 as a bas . NH4 will be it is conjugate acid .so if I know the Ka of NH4 I will apply Kw=Ka ×Kb . Ka will be for NH4 becouse it is acid (conjugate acid) while Kb for NH3 becouse its base. NH 3 is a weak base so the answer is (Kb of the weak base)