Yes, tonic water is acidic. It typically has a pH level ranging from 2.5 to 3.5, primarily due to the presence of carbonic acid and citric acid. This makes tonic water more acidic than regular tap water, which usually has a pH level of around 7.
Sparkling water typically has a pH level between 3 and 4, which means that tonic water is slightly more acidic than sparkling water. However, compared to other soft drinks like cola or lemonade, tonic water tends to be less acidic.