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

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

(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)

I had been asked this question in an international level competition.

My question is taken from Drugs Absorption topic in chapter Absorption of Drugs of Drug Biotechnology

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

To explain: For weak acids, the Henderson-Hasselbach equation is pH = pKa + log (Ionized drug concentration/ Unionized drug concentration). And the % of ionized drug = 10pH-pHKa/1+10PH-pKa * 100.

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