Question

liquid a is known to have a lower vapor pressure and lower surface tension than liquid b. use these facts to predict the result of each experiment in the table below, if you can. experiment predicted outcome 30.0 ml of liquid a are put in one sealed 5 l flask, and 30.0 ml of liquid b are put in another sealed 5 l flask. the pressure in each flask is slowly increased by pumping in argon gas. eventually both liquids boil, a first and then b. eventually both liquids boil, b first and then a. neither liquid will boil its impossible to predict whether either liquid boils without more information. 30.0 ml of liquid a are poured into a beaker. 30.0 ml of liquid b are poured into another beaker. after 90 minutes have passed, the volumes ( v_a ) and ( v_b ) of liquid in each beaker are measured. ( v_a ) will be greater than ( v_b ) ( v_a ) will be less than ( v_b ) ( v_a ) will be equal to ( v_b ) its impossible to predict whether ( v_a ) or ( v_b ) will be greater without more information.

Explanation:

Step1: Understand vapor - pressure concept

Lower vapor - pressure means higher boiling - point. Liquid A has lower vapor - pressure than Liquid B, so Liquid A has a higher boiling - point.

Step2: Analyze the first experiment

In a sealed flask, when pressure is increased by pumping in argon gas, the boiling of the liquid depends on the relationship between the vapor - pressure of the liquid and the total pressure in the flask. Since Liquid A has a higher boiling - point (lower vapor - pressure), Liquid B will boil first when the pressure is increased. So, eventually both liquids boil, B first and then A.

Step3: Understand evaporation and vapor - pressure relationship

Higher vapor - pressure means higher rate of evaporation. Liquid B has higher vapor - pressure than Liquid A.

Step4: Analyze the second experiment

After 90 minutes, the liquid with higher vapor - pressure will evaporate more. Since Liquid B has higher vapor - pressure, more of Liquid B will evaporate. So, $V_A$ will be greater than $V_B$.

Answer:

1. Eventually both liquids boil, B first and then A.
2. $V_A$ will be greater than $V_B$