Can Solubility Laws Determine the Amount of Helium Gas in 3000 Litres of Water?

[vinchem14]

Dear Forum members,

Situation: 3000 litre of water is pressurized with 1 bar helium gas in closed tank.

question 1: My question is that, if i know the solubility of helium gas in water at 1 bar partial pressure of helium over water at temp of 25 deg is 0.00145 g/litre, Whether i can apply this solubility law to entire volume of water.

Solubility value for 3000 litre of water = 0.00145*3000 = ?

Whether solubility of helium gas depends upon the surface area of exposure of water, resistance offered by the liquid to transfer the solute from water interface to its bulk volume.

or either i should interphase mass transfer theories to calculate the exact amount of soluble gases in 3000 litre of water.


question 2: If we have estimated the solubility in 3000 litres of water, how can we similarly estimate the degasification rate of solublized helium from water, if same water is kept under different conditions of nitrogen gas pressure or in a vacuum condition (after achieving sufficient solubility with helium gas). Is there any law to calculate the amount of solublized gas transfer from water to gas phase.

 

[Zefram]

Dear Forum members,

Thank you for your question. I can provide some information and insights on the solubility of helium gas in water.

To answer your first question, the solubility law can be applied to the entire volume of water in the closed tank. However, it is important to note that the solubility of helium gas in water is affected by various factors such as temperature, pressure, and surface area. Therefore, the solubility value for 3000 litres of water may not be exactly 0.00145*3000, as the conditions may differ from the standard conditions at which the solubility value was determined. It is recommended to use the appropriate equations and factors to calculate the solubility under the specific conditions in your closed tank.

Furthermore, the solubility of helium gas in water can also be affected by the surface area of exposure of water and the resistance offered by the liquid to transfer the solute from the water interface to its bulk volume. These factors can be taken into consideration by using mass transfer theories, as you mentioned.

Moving on to your second question, there is a law that can be used to estimate the degasification rate of solubilized helium from water. It is known as Henry's law, which states that the amount of gas dissolved in a liquid is directly proportional to the partial pressure of the gas above the liquid. Therefore, if the water is kept under different conditions of nitrogen gas pressure or in a vacuum, the degasification rate of solubilized helium can be estimated using Henry's law.

I hope this information helps in addressing your questions. Please let me know if you have any further inquiries.