These electrostatic effect give rise to a shrinkage of the water. 998.21 kg/m 3 0.0005780 (oz/in 3)/(kg/m 3) 0.5797 oz/in 3 Example 3: Mass of Hot Water A tank with volume 10 m 3 contains hot water with. The density in units oz/in 3 can with the converting value from above be calculated to. In this way the field tends to disrupt hydrogen bonded structures in liquid water, and to compress the water molecules surrounding an ion. Example 2: Water Density in unit oz/in 3 Water density at temperature 20 o C is 998.21 kg/m 3 (table above). The interaction of the electrostatic field of an ion with water tends to align the dipolar water molecules in the direction of the field. See this excerpt from a study on the volumetric effects due to ion-solvent interaction in aqueous electrolyte solutions: In this more ordered arrangement, the ions effectively fill the voids between the water molecules, and the volume of the water only increases slightly. The positive Hydrogen ends of the water molecules are attracted to the negatively charged Cl ions, and the positive oxygen ends are attracted to the positively charged Na ions. Because of the geometry of water molecules, they are essentially dipoles with “positive and a negative ends”. Interestingly, the dissolved salt does not increase the volume of the water by the volume of the added salt, and this is due to the charge of the Na and Cl ions and the H 2O molecules. When salt (sodium chloride or NaCl) dissolves in water, there is a significant increase in mass of the solution due to the relatively higher molecular mass of the dissolved ions Na (22 g/mol) and Cl (35.5g/mol) when compared to water or H 2O (20 g/mol).
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