what is the difference between acid and alkali
- Acid dissociation in a solution produce protons, and alkaline solutions produce hydroxide ions. - Acids turn blue litmus to red, and alkaline solutions turn red litmus to blue. - In a pH scale acids are indicated below 7, and alkaline are indicated above 7.cid vs Alkaline. Acids and bases are two important concepts in chemistry. They have contradictory properties. Alkaline is a subset of bases, thus have all the basic characteristics.