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Salt water is more dense than fresh water. Wax is less dense than Fresh water.

The density difference between wax and salt water is greater than wax and fresh water, so wax floats better.

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14y ago
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14y ago

If paraffin gets hot enough it will melt. It will float on water. Water is a polar compound. It has a positive charge on one side of a molecule and a negative charge on the other. The paraffin molecule has a neutral charge. Because their electrical charges are different, one does not dissolve in the other.

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14y ago

As a general rule, polar solvents dissolve polar compounds, and non-polar solvents dissolve non-polar compounds (known as the "like dissolves like" rule).

Water is polar and paraffin wax is non-polar, therefore water doesn't dissolve it.

Keep in mind, however, that there are exceptions to this rule.

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7y ago

Wax (even melted) will not dissolve in water because wax is non-polar and water is polar. It's the same phenomena that makes oil and water separate.

Plastic doesn't dissolve for pretty much the same reason.

Marble would dissolve given long enough - but it would take a VERY, VERY, VERY long time to dissolve it - thousands of years to dissolve a tiny bit. It took a very long time, high pressure and high temperature to form the marble so it is extremely stable and molecules are tightly bound chemically to one another. Note that if the water is acidic it can attack the marble. Acid rain can discolor and damage marble statues and facades.

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13y ago

Wax doesn't dissolve in water because it's a lipid, which acts with the same properties as oil, especially in the case that the atoms of oil will not break their bonds to mix with water.

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9y ago

Wax is a substance which is not water soluble. It can not absorb water and so water rolls off of it.

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10y ago

Because wax is a saturated hydrocarbon which is non-polar. Water dissolves polar compounds.

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12y ago

water has a higher density than paraffin hence paraffin is less dense than water so paraffin will always float on water.

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14y ago

because its density is less than water

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Q: Why does paraffin wax not melt in water?
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