We can see here that at a temperature of 10°C, it would take few seconds for 1 Alka-Seltzer tablet to react with 8 oz. of water.
We can make an estimation that it would take approximately a few minutes for the Alka-Seltzer tablet to react with the water at this temperature. The tablet will start dissolving upon contact with the water, releasing carbon dioxide gas, which causes the characteristic fizzing and effervescence.
Alka-Seltzer is a medication available in tablet or effervescent form, commonly used to relieve minor aches, pains, inflammation, and reduce fever. It's primarily used to alleviate symptoms associated with headaches, body aches, heartburn, indigestion, and upset stomach.