Chemistry Practice Problems Ka and Kb Practice Problems Solution: Given the following values of pK, which is the wea...

Solution: Given the following values of pK, which is the weakest acid of those listed in the answers?pKb of NH3 = 4.75pKa of HNO2 = 3.37pKb of  C5H5NH = 8.75pKa of  HBrO = 8.69pKa of  HClO = 7.53

Problem

Given the following values of pK, which is the weakest acid of those listed in the answers?

pKb of NH3 = 4.75

pKa of HNO2 = 3.37

pKb of  C5H5NH = 8.75

pKa of  HBrO = 8.69

pKa of  HClO = 7.53

Solution

We are asked to identify the weakest acid given. 


pKa is the negative base-10 logarithm of the acid dissociation constant (Ka) of a solution.

The lower the pKa value, the stronger the acid.


pKb is the negative base-10 logarithm of the base dissociation constant (Kb) of a solution.

The lower the pKb value, the stronger the base or the weaker.


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