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Studying hydroxide ions in water, the Pacific Northwest National Laboratory team found that the ion (center) can form two different structures: one with five hydrogen bonds (left) and the other with four.

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Document Title: Hydroxide Ions in Water
Category: Chemistry
Media Type: Graphics
Date of Image/Photo: October 30, 2009
Background: Whole water molecules form complex shapes around hydroxide ions, simple negatively charged particles, according to a recent study by scientists at Pacific Northwest National Laboratory. The shapes are the result of hydrogen bonds between the ions and the molecules. This research answers the question, debated in scientific circles for more than 70 years, of how hydroxide ions get oriented in water. This work (but not this image) graced the cover of the October 19, 2009, issue of Chemical Physics Letters.
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/DRAE-7XBVWW

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