What is acid? September 24, 2024 by Author The substances with sour taste that turn blue litmus to red and donate hydrogen ion in aqueous solution are called acids. Related Posts:Difference between molar solution and molal solutionWhy does ripe mango taste sweet?Diffusion and 3 ExperimentsLessons on LifeWhat is decimolar solution?What is the role of saliva in the digestion of food?