Question #140746

At what pH will phenobarbital begin to separate from its solution? Phenobarbital is a weak acid.

Initial conc. 0.0393M

Ionized conc. 0.0043M

Ka 3.9x10^-8

ROUND OFF TO 2 DECIMAL PLACES.

Initial conc. 0.0393M

Ionized conc. 0.0043M

Ka 3.9x10^-8

ROUND OFF TO 2 DECIMAL PLACES.

Expert's answer

**Solution.**

"3.9\\times 10^{-8} = \\frac{x^2}{(0.0393-x)}"

"x = 3.91 \\times 10^{-5}"

"pH = -lg[H^+] = 4.41"

**Answer:**

4.41

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