Anonymous asked in Science & MathematicsChemistry · 1 year ago

Alka Seltzer chemistry question.?

Alka Seltzer is a combination of citric acid, sodium bicarbonate, and aspirin. Why don’t these react with each other in the tablet since sodium bicarbonate reacts with acid in this experiment?

3 Answers

  • 1 year ago
    Favorite Answer


    Aspirin is usually the sodium salt of acetylsalicylic acid, which is soluble in water. The citric acid and sodium bicarbonate need to dissolve in water before they can react.

    NaHCO3(s) --H2O--> Na+ + HCO3^-

    C3H5O(COOH)3(s) --H2O--> C3H5O(COOH)3(aq) ................. citric acid is a weak acid

    Carbonates and bicarbonates react with acids to liberate CO2 gas. There is an excess of bicarbonate in the mixture which, when drunk, reacts with the acid in the stomach.

    3HCO3^- + C3H5O(COOH)3(aq) --> C3H5(COO)3^3- + 3CO2(g) + 3H2O(l) ..... The fiz you see and hear

    HCO3^- + H+ --> CO2(g) + H2O(l) ............. bicarbonate neutralizes acid in the stomach

  • Jim
    Lv 7
    1 year ago

    Think about the compounds that start with the letters io _ _ _, and what needs happen to them before a reaction can take place.

  • 1 year ago

    seamos nso guets

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