MindMap Gallery solubility of gas in water
This is a mind map about the solubility of gases in water. The main contents include (1), the concept of solubility (2), factors affecting the solubility of gases in water (3), and the saturation of dissolved gases in water.
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1. Solubility of gas in water
(1) The concept of solubility
Under certain conditions, after the dissolution of a certain gas in water reaches equilibrium, the amount of dissolved gas in a certain amount of water is called the solubility of the gas under specified conditions.
Representation unit
(2) Factors affecting the solubility of gases in water
1. The properties of the gas itself
√Polar gas molecules (ammonia, carbon dioxide) have high solubility in water, while non-polar gas molecules (oxygen) have low solubility in water; √The solubility of gases that can chemically react with water is large, and the solubility of gases that cannot chemically react with water is small.
2. Temperature
- Generally, as the temperature increases, the solubility of gas in water decreases.
3. Salt content
That is: under the same temperature and partial pressure, the solubility of oxygen in seawater is only about 80% to 82% of that in fresh water.
4. Gas partial pressure
(3) Saturation of dissolved gases in water
Saturation: the existing amount of dissolved gas (C) as a percentage of the saturation content (C) under the conditions (temperature, salinity, average atmospheric pressure).
Dissolved oxygen saturation content
Saturation content: When the speed of O2 dissolving into water is equal to the speed of O2 escaping from water, that is, the concentration of dissolved O2 in water when the dissolution reaches equilibrium.
Apparent Oxygen Consumption (AOU): The difference between the oxygen saturation concentration of a water body and the dissolved oxygen concentration of the water body measured on-site under the conditions of standard atmospheric pressure and air humidity of 100%.