What are the products when Alka Seltzer dissolves in water?

Hint :We know that the antacids are basically medicines. We use these when we feel our stomach upset. Now try to use these hints to identify more properties of antacids which are a kind of Alka Seltzer. Alka Seltzer is a mixture of sodium bicarbonate, citric acid, and acetyl salicylic acid.

Complete Step By Step Answer:
We should know that antacids are medicines that neutralize stomach acid to cut down on heartburn, sour stomach, acid indigestion, and stomach upset. There are antacids, which contain simethicone, an ingredient that helps your body get rid of gas. The sodium bicarbonate and citric acid are there mainly to create a pleasant tasting fizzy antacid solution. The acetyl salicylic acid is "aspirin", the active ingredient which is a pain killer, and this will only be present in small quantities probably around $ 250\text{ }mg $ per tablet.
When water is added, the sodium bicarbonate and citric acid are dissolved, forming aqueous ions which react to yield carbon dioxide, water, and the sodium salt of citric acid (sodium citrate). The pH of the final solution is sufficiently basic to act as a remedy for acid stomach and the aspirin simply dissolves in the water, so it can be consumed more easily so that it can fight headaches or similar types of pain.
The reaction is: $ {{H}_{3}}{{C}_{6}}{{H}_{5}}{{O}_{7(aq)}}+3NaHC{{O}_{3(aq)}}\to 3C{{O}_{2(g)}}+3{{H}^{2}}{{O}_{(l)}}+N{{a}_{3}}{{C}_{6}}{{H}_{5}}{{O}_{7(aq)}}. $
 $ Citric\text{ }acid\text{ }\left( aq \right)\text{ }+\text{ }Sodium\text{ }bicarbonate\text{ }\left( aq \right)\text{ }\to \text{ }Carbon\text{ }dioxide\text{ }+\text{ }water\text{ }+\text{ }Sodium\text{ }citrate. $
Therefore, the products when Alka Seltzer dissolves in water are Carbon dioxide, Water and Sodium citrate.

Note :
Remember that we should take antacids exactly as directed by your doctor or according to the package label. Always be sure to follow the directions on the label so you don’t overdose antacids. The side effects include constipation, diarrhea, changes in the color of bowel movements, and stomach cramps.