Does dissolving salt change water volume and how does the amount of salt dissolved in water affect its density?
Dissolving salt in water does not significantly change the overall volume of the water. When you add salt to water and the salt dissolves, the water molecules surround and separate the salt ions, creating a solution. The dissolved salt molecules become interspersed among the water molecules, but they do not add enough volume to substantially alter the total volume of the solution.
However, the density of the saltwater solution does change as you increase the amount of salt dissolved in it. The density of a substance is its mass per unit volume. When you add salt to water, the mass of the solution increases due to the mass of the dissolved salt. Since the volume doesn't change much, the mass increase causes the density of the solution to increase as well.
As you add more and more salt to water, the density of the solution continues to increase. This phenomenon occurs because the salt molecules increase the mass of the solution while the volume remains relatively constant. The dissolved salt particles effectively "pack" between the water molecules, making the solution denser.
It's important to note that the relationship between the amount of salt dissolved and the density isn't always linear. At some point, the solubility of the salt in water will be reached, and any additional salt you try to add won't dissolve. At that point, the density of the solution won't increase further due to salt dissolution.
The exact amount of salt that can be dissolved in water and the resulting density changes depend on factors such as temperature and pressure. In general, though, increasing the amount of salt dissolved in water will lead to an increase in the density of the solution.
Adding salt to water makes the water denser. As the salt dissolves in the water, it adds mass (more weight to the water). This makes the water denser and allows more objects to float on the surface that would sink in fresh water. About 3.5 percent of the weight of seawater comes from the dissolved salts. When salt is dissolved in fresh water, the density of the water increases because the mass of the water increases. When salt is dissolved in fresh water, the density of the water increases because the mass of the water increases. As the volume available for the particle to dissolve increases, by switching from NPV to cell or vessel volume thedissolution rate is expected to increase due to bulk concentration reduction. Surface area is larger when a given amount of a solid is present as smaller particles. Hence, the total surface area of the crushed salt will be more than that of the uncrushed crystals, resulting in higher rate of dissolving of the crushed salt in water. Actually, sodium chloride added to water will decrease the volume of the solution, up to around 2% for a saturated solution. Even when fully saturated, that's not a big change, so you may not have been able to observe it without something with a narrow neck like a volumetric flask.Salt water is denser than pure water because the salt in it contributes to the mass of the entire solution. A given quantity of solute dissolves faster when it is ground into small particles than if it is in the form of a large chunk, because more surface area is exposed. The packet of granulated sugar exposes far more surface area to the solvent and dissolves more quickly than the sugar cube.The salt concentration in slightly saline water is 1,000 to 3,000 ppm (0.1–0.3%); in moderately saline water is 3,000 to 10,000 ppm (0.3–1%); and in highly saline water is 10,000 to 35,000 ppm (1–3.5%). Seawater has a salinity of roughly 35,000 ppm, equivalent to 35 grams of salt per one liter (or kilogram) of water. At a given temperature, the density of an aqueous solution of sodium chloride, sometimes called “saline,” is a function of concentration. As the concentration of NaCl increases, the density of the solution increases in a fairly linear manner.
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