Calculating CO2 Dissolution in Water at Room Temperature

In summary, the solubility of CO2 in water at room temperature is calculated using Henry's Law, with the ideal gas constant of 0.0821 L*atm/mol*K. Temperature plays a role, with warmer water having lower solubility. Salinity can also impact solubility, with higher levels decreasing it. Common units for expressing solubility include mol/L, mmol/L, and ppm.
  • #1
knarl
8
0
Gday,

Just wondering how to work out at what pressure 7g of CO2 will dissolve in 375ml of water at room temperature. Do I need empirical data? Or can I do it analytically?

Thanks,
knarl.
 
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  • #2
Look at the bottom of this page - http://irina.eas.gatech.edu/lectures/Lec13.html [Broken]

One needs the dissociation/dissolution constants for CO2[/url] in water under the P, T conditions.
 
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  • #3


Hi knarl,

To calculate the amount of CO2 that will dissolve in water at room temperature, you can use the Henry's Law equation:

C = k * P

Where C is the concentration of dissolved CO2 in the water, k is the Henry's Law constant, and P is the partial pressure of CO2 in the gas phase. The Henry's Law constant for CO2 in water at room temperature is approximately 0.034 mol/L*atm.

To solve for P, you will need to know the solubility of CO2 in water at room temperature. This information can be found in tables or empirical data. For example, at room temperature, the solubility of CO2 in water is approximately 0.034 mol/L.

So, if you have 7g of CO2 and 375ml of water, you can convert the mass of CO2 to moles (7g / 44g/mol = 0.159 moles) and divide by the volume of water in liters (375ml / 1000 = 0.375 L) to get the concentration of CO2 in moles per liter (0.159 moles / 0.375 L = 0.424 mol/L).

Now, you can plug this concentration into the Henry's Law equation:

0.424 mol/L = 0.034 mol/L*atm * P

Solving for P, you get a partial pressure of approximately 12.5 atm.

In summary, to calculate the amount of CO2 that will dissolve in water at room temperature, you will need to use the Henry's Law equation and have information about the solubility of CO2 in water at that temperature. I hope this helps!
 

1. How is the solubility of CO2 calculated in water at room temperature?

The solubility of CO2 in water at room temperature is calculated using Henry's Law, which states that the amount of a gas dissolved in a liquid is directly proportional to the partial pressure of the gas above the liquid.

2. What is the ideal gas constant used in the calculation of CO2 solubility?

The ideal gas constant used in the calculation of CO2 solubility is 0.0821 L*atm/mol*K.

3. What is the role of temperature in calculating CO2 dissolution in water?

Temperature plays a crucial role in calculating CO2 dissolution in water. As the temperature increases, the solubility of CO2 decreases, meaning that warmer water can hold less CO2 compared to colder water.

4. Is the solubility of CO2 in water at room temperature affected by the salinity of the water?

Yes, the salinity of water can affect the solubility of CO2. Higher salinity levels can decrease the solubility of CO2, while lower salinity levels can increase it.

5. What are some common units used to express the solubility of CO2 in water at room temperature?

The solubility of CO2 in water at room temperature is commonly expressed in units of mol/L, mmol/L, or ppm (parts per million).

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