Four titration curves. Estimate all pKb values and mark line that represents wea

Question

Four titration curves. Estimate all pKb values and mark line that represents weakest base.

I do not understand the concept of these curves. I know as the titration comes closer to the equivalence point, there is usually a rapid pH change. I assume because the pH is lowering, a base is probably being titrated with an acid. But what is the purpose of knowing pKb, and how do you determine the values? Which is the weakest base and why? I'm still trying to grap this concept, as it wasn't in the book but it appeared on a quiz.

Explanation / Answer

when we get the end point or equivalence point, we can get half value of titation-point which is equal to pKa value of weak acid BH+. to get pKb value of this weak base B we substract pKa from 14. pKb is equal to pOH.

pKa1=12, pKb1= 14-12=2

pKa2=11 ,   pKb2= 14-11=3

pKa3=10 ,    pKb3=14-10= 4

pKa4=9,       pKb4= 14-9=5

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