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Unformatted text preview: Studio Chemistry Fall 2007 Got Indigestion? Need some Alka-Seltzer? 1 Alka Seltzer is an over-the-counter antacid and pain relief medication that when dissolved in water and begins fizzing. Take a closer look and you will find that an Alka Seltzer tablet contains aspirin (acetylsalicylic acid), citric acid (Figure 1), and the base sodium bicarbonate (NaHCO 3 ). 1) What do the two acids have in common? 2) When the tablet dissolves in water, the three reactions shown below take place. Balance them. HO C CH 2 C CH 2 C O OH C O OH O OH C C C C C C C O OH O C O CH 3 H H H H 1) + NaHCO 3 C C C C C C C O O- Na + O C O CH 3 H H H H + H 2 CO 3 2) HO C CH 2 C CH 2 C O O- Na + C O O- Na + O O- Na + + H 2 CO 3 + NaHCO 3 3) H 2 O + CO 2 H 2 CO 3 3) The reactions go to completion with time. Why? 1 Chen, Y.; Yaung, J. J. Chem. Educ . 2002, 79 , 7, 848-850. Figure 1: Acids in Alka-Seltzer HO C CH 2 C CH 2 C O OH C O OH O OH C C C C C C C O OH O C O CH 3 H H H H citric acid acetylsalicylic acid Studio Chemistry...
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