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The active ingredient in a Original Alka Seltzer tablet are Anhydrous citric acid (Anhydrous means that the substance has no water and is in a dry granulated form), and Sodium bicarbonate. (Sodium bicarbonate has many ways of being called, one is Sodium hydrogen carbonate, another way is Bicarbonate of soda and Baking soda) It also contains Aspirin.

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12y ago
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15y ago

It is made up of aspirin, sodium bicarbonate, and citric acid. Aspirin is C9H8O4

Sodium Bicarbonate is NaHCO3

and Citric acid is H3C6H5O7. The purpose of the Aspirin is to treat the pain that necessitates use of the alka-seltzer. the citrate ion hydrolyzes to produce a weak base that make for the antacid properties of alka-seltzer. The reaction that takes place with use of aspirin is:

H3C6H5O7 + 3CO3 --> 3 Na+ + C6H5O73- + 3H2O + 3CO2

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14y ago

Aspirin (acetylsalicylic acid), sodium bicarbonate (NaHCO3), and citric acid. Proportions are a trade secret, allegedly.

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Q: What is the chemical make up of Alka-Seltzer?
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