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pKa and pKb work on the same scale as pH and pOH, respectively. A low pKa indicates a stronger weak acid, whereas a high pKa indicates a weaker acid. In the same way, a low pKb indicates a stronger weak base, whereas a high pKb indicates a weaker base. You can look at the Ka and Kb to compare, but I personally find the pKa and the pKb scales much easier to visualize, and it's really easy to find them from the Ka and Kb (just take the -log of them!)
I agree with all the previous responses. The smaller the pKa, the larger the Ka, which means the stronger the acid. The same is also true for bases. The smaller the pKb, the larger the Kb, which means the stronger the base.
The strength of acids and bases is determined by their Ka and Kb, respectively. So the higher the Ka, the stronger the acid, and the higher the Kb, the stronger the base. However, for pKa and pKb, they work the opposite way: the higher the pKa, the weaker the acid, and the higher the pKb, the weaker the base. pKa and pKb were just created to form numbers that are easier to visualize and comprehend. However, you would usually want to convert to Ka/Kb, in which you simply take the -log of pKa or pKb.
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