Determine the saturation concentration (mg/L) of O2 in water at 10°C and 20°C at 1 atm.

To determine the saturation concentration of O2 in water at different temperatures, we can use the Bunsen solubility coefficient. This coefficient gives the volume of gas that will dissolve in one volume of water at a specific temperature and pressure.

The Bunsen solubility coefficient for O2 at 10°C and 20°C are 0.067 and 0.043 respectively.

The saturation concentration (C) can be calculated using the formula:

C = P * B

where: P is the partial pressure of the gas (in this case, it's 1 atm) B is the Bunsen solubility coefficient

So, for 10°C:

C = 1 atm * 0.067 = 0.067 atm

To convert this to mg/L, we use the conversion factor of 1 atm = 33.8 mg/L (for O2)

So, C = 0.067 atm * 33.8 mg/L/atm = 2.26 mg/L

And for 20°C:

C = 1 atm * 0.043 = 0.043 atm

Converting to mg/L:

C = 0.043 atm * 33.8 mg/L/atm = 1.45 mg/L

So, the saturation concentration of O2 in water is 2.26 mg/L at 10°C and 1.45 mg/L at 20°C.