kelas 11 ipa 01 acidbase
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http://www.detoxvortex.com/ph-balance-in-the-body.html
http://noahtablet.wordpress.com/2011/08/28/ph-chart/
http://noahtablet.wordpress.com/2011/08/28/ph-chart/
http://id.wikipedia.org/wiki/PH
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