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 base of those listed in the answers?pKb of NH3 = 4.75pKa of HNO2 = 3.37pKb C5H5NH = 8.75pKa of HBrO = 8.69pKa of HClO = 7.53

Problem

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

pKof NH= 4.75

pKa of HNO2 = 3.37

pKb C5H5NH = 8.75

pKa of HBrO = 8.69

pKa of HClO = 7.53

Solution

We're being asked to identify the weakest base based on the given pK values.

Ka represents the acid dissociation constant and it measures the strength of weak acids. In general:

• The higher the Ka the stronger the acid and the greater the concentration of H+

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

• The lower the pKa, the stronger the acid

Kb represents the base dissociation constant and it measures the strength of weak bases. In general:

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