When water temperature is 10 °C, calculate the saturation concentration for oxygen (at atmospheric pressure).
To calculate the saturation concentration for oxygen in water at a temperature of 10°C, we can use the Henry's Law equation which relates the concentration of a gas dissolved in a liquid to the partial pressure of that gas above the liquid.
The Henry's Law equation is given by:
C = H * P
Where:
C is the concentration of the gas in the liquid (in mol/L).
H is the Henry's Law constant for the gas and the liquid.
P is the partial pressure of the gas above the liquid (in atm).
For oxygen in water at atmospheric pressure (1 atm), the Henry's Law constant is approximately 0.0013 mol/L/atm.
So, to calculate the saturation concentration for oxygen at 10°C, we need to know the partial pressure of oxygen at atmospheric pressure.
Since the partial pressure of oxygen in air is about 0.21 atm, we can substitute this value into the Henry's Law equation to find the saturation concentration:
C = 0.0013 mol/L/atm * 0.21 atm
C = 0.000273 mol/L
Therefore, the saturation concentration for oxygen in water at 10°C and atmospheric pressure is approximately 0.000273 mol/L.