Editing Raoult's law
Jump to navigation
Jump to search
The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then publish the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 1: | Line 1: | ||
'''Raoult's law''' states that the [[vapour pressure]] of an [[ideal solution]] of | '''Raoult's law''' states that the [[vapour pressure]] of an [[ideal solution]] of two components is: | ||
:<math>P_v = | :<math>P_v = X_A P^*_{v,A} + X_B P^*_{v,B}</math> | ||
where <math>X_i</math> is the [[molar fraction]] of component i, and <math>P^*_{v,i}</math> is the vapour pressure of pure i. | |||
More generally, '''Raoult's law''' describes the [[partial pressure]] of component A in the vapour coexisting with a liquid mixture as: | |||
More generally, Raoult's law describes the [[partial pressure]] of component | |||
:<math> P_A = X_A P^*_{v,A} </math>. | :<math> P_A = X_A P^*_{v,A} </math>. | ||
This law is obeyed for all components of an ideal solution, and is also obeyed for the solvent of an [[ideal dilute solution]]. The solute's partial pressure of such solutions then obey [[ Henry's law]]. Ideal dilute solutions describe the limiting | This law is obeyed for all components of an ideal solution, and is also obeyed for the solvent of an [[ideal dilute solution]]. The solute's partial pressure of such solutions then obey [[ Henry's law]]. Ideal dilute solutions describe the limiting behavior of a mixture of infinite dilution. Therefore, all solutions in the limit of infinite dilution obey Raoult's law, i.e.: | ||
:<math> \lim_{X_A \rightarrow 1} P_A = X_A P^*_{v,A} </math>. | :<math> \lim_{X_A \rightarrow 1} P_A = X_A P^*_{v,A} </math>. | ||
[[category: classical thermodynamics]] | [[category: classical thermodynamics]] |