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What is the pKa for ammonia, given that the pKb for ammonia is 4.7

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Ammonia pKb=4.7 Since pKa + pKb=14, the pKa will be 9.3
Pyromorphiteid
[tex]pKa+pKb=pKw\\ pKw=14\\ pKa=pKw-pKb\\ pKa=14-4,7\\ pKa=9,3[/tex]

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