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The extra gas in carbonated water creates more pressure in your stomach, increasing the chances that your stomach will regurgitate contents upward. Some carbonated waters also include natural flavorings, such as lemon or lime, which can increase acidic content, making the heartburn worse.
Alka Seltzer tablets contain solid sodium bicarbonate and citric acid. When dropped into water, sodium citrate, carbon dioxide, and water are formed: The sodium citrate is a weak base. It neutralizes stomach acid (mainly HCl) by the following reaction: Na 3 C 3 H 5 O 7 (aq) + 3 HCl(aq) H 3 C 3 H 5 O 7 (aq) + 3 NaCl(aq). Author: Fred Senese senese@antoine.frostburg.edu.