Question

2. The quality of aquatic life depends on, among other parameters, the amount of dissolved oxygen in the water. The solubility of a gas in water is a function of the identity of the gas, the pressure of the gas over water, and the temperature of the system. Factors such as thermal pollution and decomposition of organic matter can significantly alter the oxygen content of a body of water. The temperature dependence of solubility of oxygen at 1 atm in fresh water shown in the diagram at right. a. Assuming the pressure of oxygen is 1.00 atm, what is the millimolar solubility of oxygen gas, O2, in water at 16 °C? b. Atmospheric pressure is 1.00 atm, but air is only composed of 21.0% (by moles) oxygen. What is the millimolar concentration of dissolved oxygen for a lake or stream under the partial pressure of oxygen and a temperature of 16 °C? c. In a body of fresh water, a dissolved oxygen concentration of 0.262 mM or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature? d. Why does O2 solubility decrease with increasing temperature?

          2. The quality of aquatic life depends on, among other parameters, the amount of dissolved oxygen in the water. The solubility of a gas in water is a function of the identity of the gas, the pressure of the gas over water, and the temperature of the system. Factors such as thermal pollution and decomposition of organic matter can significantly alter the oxygen content of a body of water.

The temperature dependence of solubility of oxygen at 1 atm in fresh water shown in the diagram at right.

a. Assuming the pressure of oxygen is 1.00 atm, what is the millimolar solubility of oxygen gas, O2, in water at 16 °C?

b. Atmospheric pressure is 1.00 atm, but air is only composed of 21.0% (by moles) oxygen. What is the millimolar concentration of dissolved oxygen for a lake or stream under the partial pressure of oxygen and a temperature of 16 °C?

c. In a body of fresh water, a dissolved oxygen concentration of 0.262 mM or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature?

d. Why does O2 solubility decrease with increasing temperature?

2. The quality of aquatic life depends on, among other parameters, the amount of dissolved oxygen in the water. The solubility of a gas in water is a function of the identity of the gas, the pressure of the gas over water, and the temperature of the system. Factors such as thermal pollution and decomposition of organic matter can significantly alter the oxygen content of a body of water.

The temperature dependence of solubility of oxygen at 1 atm in fresh water shown in the diagram at right.

a. Assuming the pressure of oxygen is 1.00 atm, what is the millimolar solubility of oxygen gas, O2, in water at 16 °C?

b. Atmospheric pressure is 1.00 atm, but air is only composed of 21.0% (by moles) oxygen. What is the millimolar concentration of dissolved oxygen for a lake or stream under the partial pressure of oxygen and a temperature of 16 °C?

c. In a body of fresh water, a dissolved oxygen concentration of 0.262 mM or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature?

d. Why does O2 solubility decrease with increasing temperature?

Added by Sheila B.

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