![]() Seawater has a salinity of roughly 35,000 ppm, equivalent to 35 grams of salt per one liter (or kilogram) of water. What other items can you find to test? Most items will generally float in this salt water experiment even if they sink in freshwater. The salt concentration in slightly saline water is 1,000 to 3,000 ppm (0.10.3) in moderately saline water is 3,000 to 10,000 ppm (0.31) and in highly saline water is 10,000 to 35,000 ppm (13.5). This is an example of a physical change! Do objects float better in saltwater or freshwater? ![]() This makes the water denser and allows more objects to float on the surface that would sink in fresh water. As the salt dissolves in the water, it adds mass (more weight to the water). You can experiment with many objects that sink and float in water, but what happens when you add salt to the water? Can you change whether the object, like the egg, still sinks? How does salt affect the density of water?Īdding salt to the water makes the water denser. Hollow things often float as air is less dense than water. When added to water, objects denser than water sink, and those less dense than water float. Our sink and float experiment is another exciting way to look at items that might surprise you using only water.īig items that feel light, like a ping pong ball, are less dense than smaller items that feel heavy, like a gold ring. When you add salt to the water, you are increasing the density of the water by adding more mass (or stuff) in the given volume. The egg’s density is only slightly higher than water at 1.03 g/mL, but that is enough to make the egg sink. Why do some objects sink while another object floats? An object sinks because it is denser or heavier than water and vice versa. 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 2 O (20 g/mol). The egg will sink in regular tap water because the density of the egg is greater than the density of water.
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