Like Dissolves Like - Demonstration
Some substances dissolve readily in others. Some substances do not. Some substances are more dense than others. This chapter deals with the concepts of solubility and density.
There are two approaches to the topic "Like Dissolves Like". This one provides a movie that demonstrates the concepts. The other provides a series of multimedia experiments that will encourage you to think actively about the concepts.
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Keywords
solubility, density, polar, nonpolar, soluble, insoluble, bonding, solutions
Multimedia
_Play
movie (1 minute 2 seconds, 3.7 MB)
Nonpolar carbon tetrachloride is poured into a test tube. When a nonpolar colored solid is added, the solid dissolves in the carbon tetrachloride.
When polar water is added to the test tube, it forms a layer on top of the carbon tetrachloride, since water is immiscible with, and less dense than carbon tetrachloride.
When nonpolar hexane is added to the test tube, it forms a layer on top of the water, since hexane is immiscible with, and less dense than water.
When the test tube is vigorously shaken, the two nonpolar liquids form a single layer at the bottom of the test tube, and the polar water layer sits above this layer.