7.6 Softening Hard Water

What Is Hard Water?

Hard water has a relatively large amount of calcium and magnesium ions, which interfere with the action of soap molecules. It is possible to soften or purify hard water, by using materials that have a preference for calcium and magnesium ions or by distilling the water. Duration: 6:30.

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KM: Ocean Water

Kai shows Maile an innovative way to deduce the amount of dissolved solutes in ocean water. Keep in mind that the density of a solution, such as ocean water, depends upon the amount of dissolved solutes it contains--the more solutes, the greater the density. Duration: 6:15.

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