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The antibacterial drug sulfathiazole is an acid and has a pKa = 7.4. If a plasma...

The antibacterial drug sulfathiazole is an acid and has a pKa = 7.4. If a plasma sample (pH =7.4) contains 20 mg/L of sulfathiazole, what is the approximate concentration (mg/L) in saliva (pH =8.4) at the same time?

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