That oxygen is soluble at all can be explained on two grounds. Effect of temperature on solubility. Gases. It is a good question. 1. Water at lower altitudes can hold more dissolved oxygen than water at higher altitudes. Temperature -- as temperature increases, solubility decreases 3. That oxygen is weakly soluble can be explained, as you point out, on the basis of the hydrophobic effect, which amounts to saying that water likes to hydrogen bond, and an oxygen molecule is not very good at that compared to another water molecule. Solubility. Solubility in the general sense refers to the property of being soluble — being able to dissolve, usually in a liquid. Effect of pressure on dissolved oxygen solubility . Oxygen Gas - Specific Heat - Specific heat of Oxygen Gas - O 2 - at temperatures ranging 175 - 6000 K Salinity of Water - Salinity of fresh, brackish and sea water Solubility guidelines for ionic compounds in water - Guidelines or solubility rules to predict whether or not a given ionic compound is soluble in water at room temperature Henry’s Law C dO2 = a O2 x P O2 (a O2 = 0.0031 mL O 2/ mmHg O 2 / dL blood) Common measuring units. This is true of both atmospheric and hydrostatic pressures. Dissolved oxygen will increase as pressure increases. Because of the reduced solubility of \(O_2\) at higher temperatures (Figure \(\PageIndex{2}\)), the warmer water contains less dissolved oxygen than the water did when it entered the plant. solubility coefficient of oxygen in blood (a O2). The solubility of oxygen in aqueous solutions of ethyl alcohol at 20° C. is as follows: Lecture - Water Chemistry -- Dissolved Gases -- Oxygen I. Fish and other aquatic organisms that need dissolved oxygen to live can literally suffocate if the oxygen concentration of their habitat is too low. In ethyl alcohol, oxygen is several times more soluble than in water. Effect of chemical bonding on solubility. Dissolved Oxygen Tables CALIBRATION AND OXYGEN SOLUBILITY TABLES Technical Instructions YSI, a Xylem brand • XA00055 Calibration Table Calibration Values for Various Atmospheric Pressures and Altitudes PRESSURE ALTITUDE CALIBRATION VALUE Inches Hg mm Hg kPa Feet Meters Percent Saturation 30.23 768 102.3 –276 –84 101 29.92 760 101.3 0 0 100 Insolubility. Pressure -- as pressure increases, solubility increases 2. Dissolved oxygen decreases exponentially as salt levels increase. Effect of salinity on Dissolved Oxygen solubility . Oxygen solubility in pure or fresh water at 25 °C and 1.0 atm of O 2 pressure is about 1.22 × 10 −3 mol dm −3 (the values are varied from 1.18 to 1.25 mol dm −3 as reported in different literature).3., 4. Related Answers. Answer . Oxygen solubility will increases with decreasing temperature and will decrease with increasing temperature. Properties of dissolved gases A. Solubility -- How much gas will dissolve in water? Answer . Its solubility at any temperature may be calculated from the following equation: β = 0.2337 – 0.00074688t + 0.000003288t 2. 1.3.1. With these units, the dissolved oxygen concentration must be measured in mL / dL of blood, and the partial pressure of oxygen must be measured in mmHg. It is equal to 0.0031 mL / mmHg of oxygen / dL of blood. oxygen molecule plays the vital role for living organisms. Solubility in Pure Water. So without that no living organism will survive. Solubility is the property of a solid, liquid or gaseous chemical substance called solute to dissolve in a solid, liquid or gaseous solvent.The solubility of a substance fundamentally depends on the physical and chemical properties of the solute and solvent as well as on temperature, pressure and presence of other chemicals (including changes to the pH) of the solution. That is why, at the same pressure and temperature, saltwater holds about 20% less dissolved oxygen than freshwater. Salts -- as TDS increase, solubility decreases exponentially 4.