Henry's Law

Introduced in CHE102

$P_A=H_A{x}_A$

• $P_A$ = Vapor Pressure of solute above solution
• $H_A$ = Henry’s Law Constant (depends on solute/solvent pair and on temp and units of pressure)
• $x_A$ = Mole Fraction of Solute

Another common used form:

$C_A=k_A{P}_A$

• $C_A$ = Concentration in liquid solution
• $k_A$ = Henry’s Constant
• P${}_A$ = Partial Pressure above Solution