Ethyl acetate

You have an aquarium with 200 L of water. Above the aquarium you have installed a new lamp and while trying to remove the price tag with some ethyl acetate, you have spilled 10 ml of ethyl acetate into the aquarium. The water is well mixed and so you can assume that the ethyl acetate will be distributed evenly throughout the aquarium within minutes. Your air pump delivers 0.5 L/min (volume corresponds to atmospheric pressure) air to the water.

a) Which amount (in mol) ethyl acetate per minute would be removed from the water with the air bubbles assuming that a partition equilibrium between the water and the air bubbles is established? (Water and air have a temperature of 25°C.) Are your calculations based on any simplifying assumptions?

b) How does the answer look like if you had spilled 10 ml hexane instead of ethyl acetate? Can you proceed just like in the case of ethyl acetate and just fill in different numbers or are there principal differences?

In various literature sources you find the following properties:

Ethyl acetate

Water solubility at 25 °C:	0.90 mol/L
Saturation vapor pressure at 25 °C:	12580 Pa
Measured Henry´s Law constant at 25 °C:	17.1 Pa m³ mol^-1
Melting point:	-83.6 °C
Molecular weight:	88.1 g/mol
Density at 25 °C:	0.9 g/cm³

Hexane

Water solubility at 25 °C:	1.5 10^-4 mol/L
Saturation vapor pressure at 25 °C:	20130 Pa
Measured Henry´s Law constant at 25 °C:	1.63 10⁵ Pa m³ mol^-1
Melting point:	-95 °C
Molecular weight:	86.2 g/mol
Density at 25 °C:	0.66 g/cm³

	Proceed