How you would find out is soluble aspirin is acid or alkali?

To determine if soluble aspirin is acidic or alkaline, you can dissolve it in water and test the pH of the solution using pH paper or a pH meter. Aspirin, or acetylsalicylic acid, is a weak acid, so you would expect the pH to be below 7, indicating acidity. Additionally, you could observe its reaction with baking soda (sodium bicarbonate), which would produce bubbles of carbon dioxide if it is indeed acidic.