http://phet.colorado.edu/en/simulation/soluble-salts
https://www.youtube.com/watch?v=YcZSNcaHHN8&feature=youtube_gdata_player
https://bcs.whfreeman.com/chemcom5e/content/cat_010/Unit1_Media/CC_5e_U1_SecD.swf
https://www.chem1.com/CQ/hardwater.html
http://www.ag.ndsu.edu/pubs/hs2oqual/watsys/ae1031w.htm
http://www.ehso.com/msds.php
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