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Alka Seltzer and H2o Essay Preview: Alka Seltzer and H2o Report this essay “Alka Seltzer and H2O” Introduction In this experiment I will be testing the effects altered water has on 1 tablet of alka seltzer. Alka seltzer is a tablet that is an antacid, which is used to treat pains, aches, heartburn, upset stomachs,.