00:01
So when this problem is asked, why are some aqueous solutions of salts of weak acid and weak base is neutral, whereas others are acidic and still others are basic? so this is because when we have this kind of reaction, we have to put the conjugate acid and conjugate base of the weak acid and weak base.
00:25
The solution is either acidic or basic depending on relative strengths of the two conjugates.
00:33
Occasionally, the weak acid and weak base will have the same strength.
00:37
And when this happens, the conjugate base and acid also has the same strength.
00:43
So the weak acid and weak base have the same strength in the beginning, and this results in a neutral solution.
00:54
However, if this is not the case, so if we have, for example, a weak acid that is stronger than the weak base, the conjugate base and acid will not have the same strength, and this will affect the ph of the solution.
01:05
To predict if the particular combination will be acidic base or neutral, we have to compare the k values of the conjugates.
01:16
So if we have, for example, a conjugate base of the weak acid that is stronger compared to the conjugate acid of the weak base initially in solution, then the resulting solution will be acidic.
01:35
So it really just depends on the relative k values and strains of...