Henderson$-$Hasselbach equation

acid: pH $=$ pKa $+$ log $([$A$]/[$HA$])$

base: pH $=$ pKa $+$ log $([$HA$]/[$A$])$

Based on the H$-$H equation, calculate the nonionic $-$ to $-$ ionic ration of the drugs within the respective compartments $($stomach$,$ small intestine$),$ according to the following $4$ Tables $($Tables

$10\mathrm{.}1-10\mathrm{.}4).$

Show details of all calculations.

Also, give a brief explanation on the conditions for absorption$.$

Table $10\mathrm{.}4$: Structure and chemical properties in small intestine

$(pH=8-10$ of morphine sulfate and $Na$ phenobarbital