What is the meaning of the dot notation in chemistry?

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The discussion centers around the term "dot" in the context of a chemical formula, specifically "5H2O." This notation indicates that the compound is hydrated, meaning it includes water molecules as part of its structure. The participants clarify that this concept relates to hydrates and water of crystallization, which are essential in understanding how certain compounds interact with water. The original poster expresses gratitude for the clarification, acknowledging that they had overlooked this section in their studies.
Mu naught
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Sorry this is a really basic question but I'm studying for a chemistry exam which spans about 4-5 chapters and I don't have time to spend re-reading them all trying to find out one little question...

Here is an example:

[PLAIN]http://img221.imageshack.us/img221/91/chemistryq.png

I don't understand what is meant by the "dot" 5H_2O. I don't know how to phrase my question so as to get an answer from google.

If someone could quickly reply and explain what's being asked it'd be a great help to me.

Thank you.
 
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