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Aug 1, 2005 · http://galileoweb.org/oconnorh/2014/03/17/chemistry-lesson-acids-and-bases/ WebMar 17, 2014 · Acids and Bases Computer Lesson: I. pH of common substances: Go to http://www.harcourtschool.com/activity/acids/.. List the five colors of the pH paper and the five ... kids halloween ghost costume