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NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Hydrated vs Hygroscopic Crystal 
Name: Angela
Status: N/A
Age: 16
Location: N/A
Country: N/A
Date: 2001 - 2002
Question:
What is the difference between a hydrated crystal and a crystal, which is hygroscopic?

Replies:
A hydrated crystal is a crystal that contains water as part of its chemical formula and structure. It may or may not absorb water vapor from the atmosphere. A crystal that is hygroscopic is one that absorbs water vapor from the atmosphere. CaCl2 and P2O5 are examples.

Vince Calder


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