At fixed pressure, the solubility of a gas in a liquid decreases when the value of Henry's law constant increases. Which equation best explains this?
A$x = PK_H$
B$x = K_H/P$
C$x = P/K_H$
D$x = P + K_H$
Answer & Solution
Correct answer: C. $x = P/K_H$
The governing relation is $P = K_H x$, so rearranging gives $x = P/K_H$. Thus, for fixed $P$, increasing $K_H$ lowers $x$, meaning lower solubility.
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