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Which of the following equations correct for Henderson-Hasselbach equation for weak bases?

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Which of the following equations correct for Henderson-Hasselbach equation for weak bases?

(a) PH = pKa – log (Unionized drug concentration /Ionized drug concentration)

(b) PH = pKa – log (Ionized drug concentration/ Unionized drug concentration)

(c) PH = pKa + log (Ionized drug concentration/ Unionized drug concentration)

(d) PH = pKa + log (Unionized drug concentration /Ionized drug concentration)

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The correct option is (d) PH = pKa + log (Unionized drug concentration /Ionized drug concentration)

The best explanation: For weak bases, the Henderson-Hasselbach equation is pH = pKa + log (Unionized drug concentration /Ionized drug concentration). And the % of ionized drug = 10pKa-pH/1+10 pKa-pH * 100.

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