Purpose

Well again, why all this about the ocean? Primarily to bring out a few basic ideas.

One of those ideas is that some things will dissolve in water, such as salt. We want to know about the nature or the properties of those things that will allow them to dissolve in water.

Another basic idea is that there are some things that will not dissolve in water, such as oil. What is the nature (what are the properties) of those materials that keeps them from dissolving in water?

Those are some of the things that we will be pursuing in this lesson. Here are some more.

What happens to materials when they dissolve? Salt is a white crystalline solid. When you add it to water, it just seems to disappear. How can it do that? What is happening?
And what about this, anhydrous cupric sulfate? Look what happens when it dissolves in water.
What about the water? When salt is added, it conducts electricity better, boils at a higher temperature and freezes at a lower temperature. There are other changes that we will deal with as we go through this lesson on solutions.

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E-mail instructor: Eden Francis

Clackamas Community College
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