What is the meaning of the dot notation in chemistry?

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SUMMARY

The dot notation in chemistry, specifically in the context of compounds like 5H2O, indicates that the compound is hydrated. This notation signifies the presence of water molecules associated with the compound, which is a critical concept in understanding hydrates. The discussion references key resources, including Wikipedia articles on hydrates and water of crystallization, which provide further clarification on this topic.

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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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