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Alka seltzer contains a combination of aspirin, citric acid, and sodium bicarbonate (baking soda). The aspirin works to relieve headaches and muscle pain. The last two ingredients, citric acid and sodium bicarbonate, are simply a mixture of a weak acid and a weak base (when you add alka seltzer to water, the fizzing is the reaction of the two with each other). When you have a weak acid and a weak base, the result is a buffer solution, which works to stabilize the pH.

Aspirin (Acetylsalicylic acid) is also a weak acid which would be water soluble. However, in drinking water it will dissolve slowly. Adding a weak base (sodium bicarbonate) would help force the aspirin into it's conjugate base form, increasing the polarity, and thus increase solubility.

Other WikiAnswers pages indicate a pH of 9.2, a basic solution which is probably to increase the solubility of the Aspirin, as well as both buffering the effects of Aspirin's acidity on the stomach lining, as well as working as an antacid to buffer the stomach acid.

One notes, of course, that Sodium Bicarbonate (NaHCO3) dissociates in water (with the help of acetic acid) into Na+ OH- CO2, I.E. Sodium Hydroxide, a base, and Carbon Dioxide which would be the direct cause of the fizzing effect.

See the Web Links and Related Questions to the left for more information.

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โˆ™ 2010-11-11 03:59:03
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Q: What are the active ingredients in alka seltzer?
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Are all the ingreidents in alka seltzer?

If it seems to work as it should I would say that all the ingredients are in alka seltzer.


Why does alka-seltzer help an upset stomach feel better?

Alka-Seltzer includes aspirin and sodium bicarbonate in its ingredients. A stomach feels upset due to acid. Alka-Seltzer works as a base to neutralize the acid.


What are the ingrediance in Alka-seltzer?

Aspirin and sodium bicarbonate are the ingredients in Alka Seltzer. Two tablets are the equivalent of two regular aspirin and baking soda, which is an acid reducer in itself. But the sodium bicarbonate in alka seltzer is heat treated.


Why does alka seltzer bubble in the water?

Alka seltzer has sodium bicarbonate (baking soda) and citric acid in its ingredients. when the alka seltzer hits the water, the baking soda and citric acid react, forming the CO2 bubbles that rise to the surface.


What are the ingredients in alka seltzer?

Aspirin, Citric Acid and Sodium Bicarbonate (NaHCO3)


Chemical formula for alka-seltzer?

There is no chemical formula for alka-selzer, as it is a mixture of multiple compounds. The active ingredients in it are sodium bicarbonate (NaHCO3), citric acid (C6H8O7), and sometimes potassium bicarbonate (KHCO3).


What is the effect of acidity on Alka-Seltzer tablets?

Alka-Seltzer is an antacid.


What ingredients are both in alka seltzer and Tylenol?

aspririn and citric acid and sodium bicarbonate


Why is Alka-Seltzer no longer sold in the Philippines?

The people in the Philippines believe that Alka-Seltzer is not a medicine and that Alka-Seltzer should not be considered a medicine


What is the pH of alka seltzer water?

Alka-seltzer water has a pH of about 9


Can you take Tamiflu with alka-seltzer plus?

Can you take alka seltzer with tamiflu


What is an alka-seltzer?

Alka-seltzer is a white tablet that is used for when your stomch is upset.


Who is the inventor of alka seltzer?

Jackson McKinsey was the inventor of alka-seltzer in 1931.


Why does alka-seltzer dissolve in vinegar?

Alka Seltzer dissolves in vinegar because vinegar contains water. Alka Seltzer was designed to dissolve in water.


Can you take Alka seltzer while on Prozac?

Yes, alka seltzer does not interact with prozac.


How fast does alka-seltzer dissolve in water?

Alka Seltzer dizzolves in 33.1 sedonds


Can you make alka-seltzer fizz faster or slower?

because alka seltzer has to deserved in


Will alka seltzer help pass urine test?

Can alka seltzer clean your urine


What dissolves alka seltzer the best?

Alka seltzer dissolves best in coke. There is a famous experiment of dropping alka seltzer tablets in to the coke and watch the stream of foam erupt. This can be possible only if alka seltzer can dissolve quickly enough.


What is the pH of alka-seltzer?

The pH level of Alka-Seltzer is 9.2. Pure water has a pH of 7. Alka-Seltzer is sold worldwide and was first introduced in 1931.


What was the alka seltzer boy with a tablet on his heads name?

The Alka Seltzer boy's name was "Speedy."


What is alkaseltser?

"alka seltzer" po ang tamang "spelling" SEE ALKA SELTZER in your encyclopedia


What is alka seltzer used for?

Alka-Seltzer is used for upset stomach, acid indigestion and headache.


What is Alka-Seltzer's compound?

Alka-Seltzer contain aspirin, citric acid and sodium bicarbonate.


Why does alka seltzer fizz?

If you look at the ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate(baking soda). When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz.

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