Why does diet pepsi taste like soda alka seltzer?

Diet Pepsi may taste similar to Alka-Seltzer for some individuals due to its artificial sweeteners, such as Aspartame or acesulfame potassium, which can impart a slightly medicinal or chemical flavor. Additionally, the carbonation and acidity in both beverages could contribute to a similar mouthfeel, enhancing the perception of similarity. Individual taste preferences and sensitivities also play a significant role in how flavors are perceived.