If you like us, please share us on social media.
The latest UCD Hyperlibrary newsletter is now complete, check it out.

GeoWiki.png
ChemWiki: The Dynamic Chemistry E-textbook > Development Details > Approaches > Demos > Additional Demos > Volume of Mixing Demonstration

MindTouch
Copyright (c) 2006-2014 MindTouch Inc.
http://mindtouch.com

This file and accompanying files are licensed under the MindTouch Master Subscription Agreement (MSA).

At any time, you shall not, directly or indirectly: (i) sublicense, resell, rent, lease, distribute, market, commercialize or otherwise transfer rights or usage to: (a) the Software, (b) any modified version or derivative work of the Software created by you or for you, or (c) MindTouch Open Source (which includes all non-supported versions of MindTouch-developed software), for any purpose including timesharing or service bureau purposes; (ii) remove or alter any copyright, trademark or proprietary notice in the Software; (iii) transfer, use or export the Software in violation of any applicable laws or regulations of any government or governmental agency; (iv) use or run on any of your hardware, or have deployed for use, any production version of MindTouch Open Source; (v) use any of the Support Services, Error corrections, Updates or Upgrades, for the MindTouch Open Source software or for any Server for which Support Services are not then purchased as provided hereunder; or (vi) reverse engineer, decompile or modify any encrypted or encoded portion of the Software.

A complete copy of the MSA is available at http://www.mindtouch.com/msa

Volume of Mixing Demonstration

Chemical Concepts Demonstrated

  • Spaces between particles in a solution
  • Liquid lattices
  • Polarity

Demonstration

500 mL of 190-or 200-proof ethanol is added to 500 mL of water. volume.gif

Observations

The two liquids combine to form about 970 ml of solution.

Explanation

Both of these liquids are polar.  As such, they create intermolecular lattices, arranging themselves on the basis of the charges they carry and hydrogen bonding.  Because of the necessary shapes of these lattices, these liquids don't "pack" (i.e. form lattices that conserve space) as well as if they were nonpolar.  This creates spaces between the molecules.

When the two liquids are mixed, the molecules of the liquids can go into the other liquid's available spaces.  They can do this because they are both polar and can mix freely.  Because the molecules of the two liquids are different sizes, their resulting intermolecular lattice can be better arranged to conserve more space.  The mixture of the two liquids takes up less volume than the two liquids did separately.

Contributors

You must to post a comment.
Last Modified
10:31, 2 Oct 2013

Tags

Classifications

(not set)
(not set)

Creative Commons License Unless otherwise noted, content in the UC Davis ChemWiki is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. Permissions beyond the scope of this license may be available at copyright@ucdavis.edu. Questions and concerns can be directed toward Prof. Delmar Larsen (dlarsen@ucdavis.edu), Founder and Director. Terms of Use