For people assigned female at birth and 4 to 5.5 for people assigned male at birth, according to a june 2017 study in the journal of clinical and aesthetic dermatology. Our data also proves that the alka seltzer tablet in the salt water dissolved the slowest (42.76 seconds). Alka-seltzer Heartburn Effervescent Tablets Lemon Lime - 36 Ct - The Online Drugstore Learn about heartburn so you can enjoy life’s good stuff even more. How long does it take for alka-seltzer to work for heartburn . Fully dissolve 2 tablets in 4 ounces of water before taking. Leave a comment / asking / by pedro. In alka seltzer extra strength heartburn relief chews the active ingredient is: Read all information given to you. For potential or actual medical emergencies, immediately call 911 or your local emergency service. That information alone is the big tip off not to drink alcohol at all. It is used to treat heartburn and upset stomach. As for ph, the typical range for our skin is 4.5 to 5...