Is salt water more dense then cold water?

Answer 1

Yes, salt water has a greater density than fresh water.

The ocean is about 2.5% denser than fresh water. This causes greater buoyancy of objects and a swimmer can notice this easily.

Usually, when any solute is added to a solvent, the resultant solution increases in density, but there are exceptions to this rule. In the case of salt water, two things combine to cause the increase in density. First, a cubic centimeter of salt is about twice the mass of a cubic centimeter of water. Second, if you add a cubic centimeter of salt to a liter of water, the volume will increase by only about half a cubic centimeter. (This is because the dissolved sodium (Na+) and Chlorine (Cl-) atoms strongly interact with the polar water molecules causing rearrangement of water molecules near the ions which results in the nearby water atoms occupying a smaller volume.)

If one is more precise about density, one needs to specify temperature. Cold salt water has a greater density than warm salt water; similarly for fresh water. Salt affects the temperature of water freezing and the density of water is peculiar near freezing anyway, so one needs to be careful when making general statements about water density and salt and temperature when the system is within a few degrees of freezing.

Answer 2

Yes. If you dissolve a tablespoon full of salt in a glass of water (having first marked the level of the water in the glass), you will see that once the salt has COMPLETELY dissolved, the level of the water has not changed. But the water in the class is now heavier because it contains the salt. As density = mass/volume, the density must have gone up.

Answer 3

salt water. molecules are closer together.

Answer 4

simple answer ............................................ yes

Answer 5

Yes, the salt makes it more dense.

Answer 6

Salt water is denser than fresh water.

Answer 7

yes

Answer 8

Yes

Answer 9

Ocean water

Answer 10

yes